656551507657 has 16 divisors (see below), whose sum is σ = 696138043392. Its totient is φ = 617072843520.

The previous prime is 656551507631. The next prime is 656551507673. The reversal of 656551507657 is 756705155656.

It is not a de Polignac number, because 656551507657 - 2¹⁹ = 656550983369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656551507357) 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, 48386488 + ... + 48400054.

It is an arithmetic number, because the mean of its divisors is an integer number (43508627712).

Almost surely, 2^656551507657 is an apocalyptic number.

It is an amenable number.

656551507657 is a deficient number, since it is larger than the sum of its proper divisors (39586535735).

656551507657 is a wasteful number, since it uses less digits than its factorization.

656551507657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17328.

The product of its (nonzero) digits is 33075000, while the sum is 58.

The spelling of 656551507657 in words is "six hundred fifty-six billion, five hundred fifty-one million, five hundred seven thousand, six hundred fifty-seven".