656610454561 has 8 divisors (see below), whose sum is σ = 660072996864. Its totient is φ = 653148170880.

The previous prime is 656610454517. The next prime is 656610454567. The reversal of 656610454561 is 165454016656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656610454561 - 2³⁷ = 519171501089 is a prime.

It is a super-2 number, since 2×656610454561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656610454567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7123776 + ... + 7215358.

It is an arithmetic number, because the mean of its divisors is an integer number (82509124608).

Almost surely, 2^656610454561 is an apocalyptic number.

It is an amenable number.

656610454561 is a deficient number, since it is larger than the sum of its proper divisors (3462542303).

656610454561 is a wasteful number, since it uses less digits than its factorization.

656610454561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129311.

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 656610454561 in words is "six hundred fifty-six billion, six hundred ten million, four hundred fifty-four thousand, five hundred sixty-one".