656264646420 has 96 divisors (see below), whose sum is σ = 1842732974208. Its totient is φ = 174509862912.

The previous prime is 656264646419. The next prime is 656264646421. The reversal of 656264646420 is 24646462656.

656264646420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (656264646419) and next prime (656264646421).

It is a super-2 number, since 2×656264646420² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656264646421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 61749147 + ... + 61759773.

It is an arithmetic number, because the mean of its divisors is an integer number (19195135148).

Almost surely, 2^656264646420 is an apocalyptic number.

656264646420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

656264646420 is an abundant number, since it is smaller than the sum of its proper divisors (1186468327788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656264646420 is a wasteful number, since it uses less digits than its factorization.

656264646420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13449 (or 13447 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 51.

It can be divided in two parts, 6562646 and 46420, that added together give a palindrome (6609066).

The spelling of 656264646420 in words is "six hundred fifty-six billion, two hundred sixty-four million, six hundred forty-six thousand, four hundred twenty".