656667055672 has 8 divisors (see below), whose sum is σ = 1231250729400. Its totient is φ = 328333527832.

The previous prime is 656667055651. The next prime is 656667055769. The reversal of 656667055672 is 276550766656.

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 656667055672.

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, 41041690972 + ... + 41041690987.

It is an arithmetic number, because the mean of its divisors is an integer number (153906341175).

Almost surely, 2^656667055672 is an apocalyptic number.

It is an amenable number.

656667055672 is a deficient number, since it is larger than the sum of its proper divisors (574583673728).

656667055672 is a wasteful number, since it uses less digits than its factorization.

656667055672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82083381965 (or 82083381961 counting only the distinct ones).

The product of its (nonzero) digits is 95256000, while the sum is 61.

The spelling of 656667055672 in words is "six hundred fifty-six billion, six hundred sixty-seven million, fifty-five thousand, six hundred seventy-two".