31779156712 has 8 divisors (see below), whose sum is σ = 59585918850. Its totient is φ = 15889578352.

The previous prime is 31779156707. The next prime is 31779156749. The reversal of 31779156712 is 21765197713.

It can be written as a sum of positive squares in only one way, i.e., 29823217636 + 1955939076 = 172694^2 + 44226^2 .

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, 1986197287 + ... + 1986197302.

Almost surely, 2^31779156712 is an apocalyptic number.

It is an amenable number.

31779156712 is a deficient number, since it is larger than the sum of its proper divisors (27806762138).

31779156712 is a wasteful number, since it uses less digits than its factorization.

31779156712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972394595 (or 3972394591 counting only the distinct ones).

The product of its digits is 555660, while the sum is 49.

The spelling of 31779156712 in words is "thirty-one billion, seven hundred seventy-nine million, one hundred fifty-six thousand, seven hundred twelve".