31668664072 has 8 divisors (see below), whose sum is σ = 59378745150. Its totient is φ = 15834332032.

The previous prime is 31668664063. The next prime is 31668664109. The reversal of 31668664072 is 27046686613.

It can be written as a sum of positive squares in only one way, i.e., 16508652196 + 15160011876 = 128486^2 + 123126^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1979291497 + ... + 1979291512.

Almost surely, 2^31668664072 is an apocalyptic number.

It is an amenable number.

31668664072 is a deficient number, since it is larger than the sum of its proper divisors (27710081078).

31668664072 is a wasteful number, since it uses less digits than its factorization.

31668664072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3958583015 (or 3958583011 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 49.

The spelling of 31668664072 in words is "thirty-one billion, six hundred sixty-eight million, six hundred sixty-four thousand, seventy-two".