2665623280 has 40 divisors (see below), whose sum is σ = 6199826400. Its totient is φ = 1065861888.

The previous prime is 2665623229. The next prime is 2665623281. The reversal of 2665623280 is 823265662.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665623281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334381 + ... + 342259.

It is an arithmetic number, because the mean of its divisors is an integer number (154995660).

Almost surely, 2^2665623280 is an apocalyptic number.

2665623280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2665623280 is an abundant number, since it is smaller than the sum of its proper divisors (3534203120).

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

2665623280 is a wasteful number, since it uses less digits than its factorization.

2665623280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12121 (or 12115 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 40.

The square root of 2665623280 is about 51629.6744130737. The cubic root of 2665623280 is about 1386.5416641304.

The spelling of 2665623280 in words is "two billion, six hundred sixty-five million, six hundred twenty-three thousand, two hundred eighty".