656767578012 has 96 divisors (see below), whose sum is σ = 1895580288000. Its totient is φ = 172342950912.

The previous prime is 656767578007. The next prime is 656767578013. The reversal of 656767578012 is 210875767656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656767578013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1293837 + ... + 1728452.

It is an arithmetic number, because the mean of its divisors is an integer number (19745628000).

Almost surely, 2^656767578012 is an apocalyptic number.

It is an amenable number.

656767578012 is an abundant number, since it is smaller than the sum of its proper divisors (1238812709988).

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

656767578012 is a wasteful number, since it uses less digits than its factorization.

656767578012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022515 (or 3022513 counting only the distinct ones).

The product of its (nonzero) digits is 29635200, while the sum is 60.

The spelling of 656767578012 in words is "six hundred fifty-six billion, seven hundred sixty-seven million, five hundred seventy-eight thousand, twelve".