656581012 has 6 divisors (see below), whose sum is σ = 1149016778. Its totient is φ = 328290504.

The previous prime is 656581007. The next prime is 656581031. The reversal of 656581012 is 210185656.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 474978436 + 181602576 = 21794^2 + 13476^2 .

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82072623 + ... + 82072630.

Almost surely, 2^656581012 is an apocalyptic number.

It is an amenable number.

656581012 is a deficient number, since it is larger than the sum of its proper divisors (492435766).

656581012 is a wasteful number, since it uses less digits than its factorization.

656581012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164145257 (or 164145255 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 656581012 is about 25623.8367931112. The cubic root of 656581012 is about 869.1527454287.

The spelling of 656581012 in words is "six hundred fifty-six million, five hundred eighty-one thousand, twelve".