10656557521 has 16 divisors (see below), whose sum is σ = 10910560320. Its totient is φ = 10405255680.

The previous prime is 10656557503. The next prime is 10656557537. The reversal of 10656557521 is 12575565601.

It is a cyclic number.

It is not a de Polignac number, because 10656557521 - 2¹³ = 10656549329 is a prime.

It is a super-2 number, since 2×10656557521² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10656557581) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7435821 + ... + 7437253.

It is an arithmetic number, because the mean of its divisors is an integer number (681910020).

Almost surely, 2^10656557521 is an apocalyptic number.

It is an amenable number.

10656557521 is a deficient number, since it is larger than the sum of its proper divisors (254002799).

10656557521 is a wasteful number, since it uses less digits than its factorization.

10656557521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2256.

The product of its (nonzero) digits is 315000, while the sum is 43.

The spelling of 10656557521 in words is "ten billion, six hundred fifty-six million, five hundred fifty-seven thousand, five hundred twenty-one".