2515564656 has 120 divisors (see below), whose sum is σ = 7728005376. Its totient is φ = 757537920.

The previous prime is 2515564637. The next prime is 2515564663. The reversal of 2515564656 is 6564655152.

2515564656 is a `hidden beast` number, since 2 + 5 + 1 + 556 + 46 + 56 = 666.

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, 253321 + ... + 263063.

Almost surely, 2^2515564656 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 2515564656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3864002688).

2515564656 is an abundant number, since it is smaller than the sum of its proper divisors (5212440720).

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

2515564656 is a wasteful number, since it uses less digits than its factorization.

2515564656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9931 (or 9922 counting only the distinct ones).

The product of its digits is 1080000, while the sum is 45.

The square root of 2515564656 is about 50155.4050526960. The cubic root of 2515564656 is about 1360.0195816096.

The spelling of 2515564656 in words is "two billion, five hundred fifteen million, five hundred sixty-four thousand, six hundred fifty-six".