31347387664 has 10 divisors (see below), whose sum is σ = 60735563630. Its totient is φ = 15673693824.

The previous prime is 31347387649. The next prime is 31347387679. The reversal of 31347387664 is 46678374313.

It is an interprime number because it is at equal distance from previous prime (31347387649) and next prime (31347387679).

It can be written as a sum of positive squares in only one way, i.e., 17691128064 + 13656259600 = 133008^2 + 116860^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 979605849 + ... + 979605880.

It is an arithmetic number, because the mean of its divisors is an integer number (6073556363).

Almost surely, 2^31347387664 is an apocalyptic number.

It is an amenable number.

31347387664 is a deficient number, since it is larger than the sum of its proper divisors (29388175966).

31347387664 is a wasteful number, since it uses less digits than its factorization.

31347387664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1959211737 (or 1959211731 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 52.

The spelling of 31347387664 in words is "thirty-one billion, three hundred forty-seven million, three hundred eighty-seven thousand, six hundred sixty-four".