656405012 has 12 divisors (see below), whose sum is σ = 1179755220. Its totient is φ = 319332096.

The previous prime is 656404999. The next prime is 656405017. The reversal of 656405012 is 210504656.

It can be written as a sum of positive squares in 2 ways, for example, as 504721156 + 151683856 = 22466^2 + 12316^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656405017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2217437 + ... + 2217732.

It is an arithmetic number, because the mean of its divisors is an integer number (98312935).

Almost surely, 2^656405012 is an apocalyptic number.

It is an amenable number.

656405012 is a deficient number, since it is larger than the sum of its proper divisors (523350208).

656405012 is a wasteful number, since it uses less digits than its factorization.

656405012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4435210 (or 4435208 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 656405012 is about 25620.4022606984. The cubic root of 656405012 is about 869.0750781642.

Adding to 656405012 its reverse (210504656), we get a palindrome (866909668).

The spelling of 656405012 in words is "six hundred fifty-six million, four hundred five thousand, twelve".