656113722121 has 16 divisors (see below), whose sum is σ = 773040356928. Its totient is φ = 548998200000.

The previous prime is 656113722101. The next prime is 656113722157. The reversal of 656113722121 is 121227311656.

It is a cyclic number.

It is not a de Polignac number, because 656113722121 - 2¹³ = 656113713929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656113722101) 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, 6561630 + ... + 6660871.

It is an arithmetic number, because the mean of its divisors is an integer number (48315022308).

Almost surely, 2^656113722121 is an apocalyptic number.

It is an amenable number.

656113722121 is a deficient number, since it is larger than the sum of its proper divisors (116926634807).

656113722121 is a wasteful number, since it uses less digits than its factorization.

656113722121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13222872.

The product of its digits is 30240, while the sum is 37.

The spelling of 656113722121 in words is "six hundred fifty-six billion, one hundred thirteen million, seven hundred twenty-two thousand, one hundred twenty-one".