2659897440 has 432 divisors, whose sum is σ = 9897542928. Its totient is φ = 674085888.

The previous prime is 2659897417. The next prime is 2659897453. The reversal of 2659897440 is 447989562.

2659897440 is a `hidden beast` number, since 2 + 6 + 598 + 9 + 7 + 4 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (432).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 61858059 + ... + 61858101.

It is an arithmetic number, because the mean of its divisors is an integer number (22910979).

Almost surely, 2^2659897440 is an apocalyptic number.

2659897440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2659897440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4948771464).

2659897440 is an abundant number, since it is smaller than the sum of its proper divisors (7237645488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2659897440 is an equidigital number, since it uses as much as digits as its factorization.

2659897440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The square root of 2659897440 is about 51574.1935467730. The cubic root of 2659897440 is about 1385.5481745324.

The spelling of 2659897440 in words is "two billion, six hundred fifty-nine million, eight hundred ninety-seven thousand, four hundred forty".