656216120 has 64 divisors (see below), whose sum is σ = 1726686720. Its totient is φ = 219752064.

The previous prime is 656216087. The next prime is 656216123. The reversal of 656216120 is 21612656.

It is a super-2 number, since 2×656216120² = 861239192295708800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656216123) 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, 15212 + ... + 39291.

It is an arithmetic number, because the mean of its divisors is an integer number (26979480).

Almost surely, 2^656216120 is an apocalyptic number.

It is an amenable number.

656216120 is an abundant number, since it is smaller than the sum of its proper divisors (1070470600).

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

656216120 is a wasteful number, since it uses less digits than its factorization.

656216120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54564 (or 54560 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 656216120 is about 25616.7156364746. The cubic root of 656216120 is about 868.9917063252.

Adding to 656216120 its reverse (21612656), we get a palindrome (677828776).

The spelling of 656216120 in words is "six hundred fifty-six million, two hundred sixteen thousand, one hundred twenty".