656316332321 has 16 divisors (see below), whose sum is σ = 768002403840. Its totient is φ = 555430296960.

The previous prime is 656316332267. The next prime is 656316332333. The reversal of 656316332321 is 123233613656.

It is a cyclic number.

It is not a de Polignac number, because 656316332321 - 2⁶ = 656316332257 is a prime.

It is a super-2 number, since 2×656316332321² (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 (656316532321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42849620 + ... + 42864933.

It is an arithmetic number, because the mean of its divisors is an integer number (48000150240).

Almost surely, 2^656316332321 is an apocalyptic number.

It is an amenable number.

656316332321 is a deficient number, since it is larger than the sum of its proper divisors (111686071519).

656316332321 is a wasteful number, since it uses less digits than its factorization.

656316332321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85714616.

The product of its digits is 349920, while the sum is 41.

Adding to 656316332321 its reverse (123233613656), we get a palindrome (779549945977).

The spelling of 656316332321 in words is "six hundred fifty-six billion, three hundred sixteen million, three hundred thirty-two thousand, three hundred twenty-one".