2500656664 has 96 divisors (see below), whose sum is σ = 5362560000. Its totient is φ = 1091217600.

The previous prime is 2500656643. The next prime is 2500656713. The reversal of 2500656664 is 4666560052.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5011087 + ... + 5011585.

It is an arithmetic number, because the mean of its divisors is an integer number (55860000).

Almost surely, 2^2500656664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2500656664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2681280000).

2500656664 is an abundant number, since it is smaller than the sum of its proper divisors (2861903336).

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

2500656664 is a wasteful number, since it uses less digits than its factorization.

2500656664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 710 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 2500656664 is about 50006.5662088490. The cubic root of 2500656664 is about 1357.3276285834.

The spelling of 2500656664 in words is "two billion, five hundred million, six hundred fifty-six thousand, six hundred sixty-four".