2566661760 has 384 divisors, whose sum is σ = 9650309760. Its totient is φ = 624844800.

The previous prime is 2566661753. The next prime is 2566661813. The reversal of 2566661760 is 671666652.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 47 ways as a sum of consecutive naturals, for example, 11306767 + ... + 11306993.

It is an arithmetic number, because the mean of its divisors is an integer number (25131015).

Almost surely, 2^2566661760 is an apocalyptic number.

2566661760 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 2566661760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4825154880).

2566661760 is an abundant number, since it is smaller than the sum of its proper divisors (7083648000).

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

2566661760 is a wasteful number, since it uses less digits than its factorization.

2566661760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 2566661760 is about 50662.2320866343. The cubic root of 2566661760 is about 1369.1663388507.

The spelling of 2566661760 in words is "two billion, five hundred sixty-six million, six hundred sixty-one thousand, seven hundred sixty".