656596585695655 has 16 divisors (see below), whose sum is σ = 859550147664768. Its totient is φ = 477521719380000.

The previous prime is 656596585695637. The next prime is 656596585695667. The reversal of 656596585695655 is 556596585695656.

It is not a de Polignac number, because 656596585695655 - 2⁷ = 656596585695527 is a prime.

It is a super-2 number, since 2×656596585695655² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 656596585695655.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29727981 + ... + 46871590.

It is an arithmetic number, because the mean of its divisors is an integer number (53721884229048).

Almost surely, 2^{656596585695655} is an apocalyptic number.

656596585695655 is a deficient number, since it is larger than the sum of its proper divisors (202953561969113).

656596585695655 is a wasteful number, since it uses less digits than its factorization.

656596585695655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76755438.

The product of its digits is 393660000000, while the sum is 91.

Subtracting from 656596585695655 its reverse (556596585695656), we obtain a palindrome (99999999999999).

The spelling of 656596585695655 in words is "six hundred fifty-six trillion, five hundred ninety-six billion, five hundred eighty-five million, six hundred ninety-five thousand, six hundred fifty-five".