31945447316664 has 128 divisors (see below), whose sum is σ = 106751703744000. Its totient is φ = 8646887987712.

The previous prime is 31945447316641. The next prime is 31945447316669. The reversal of 31945447316664 is 46661374454913.

It is a hoax number, since the sum of its digits (63) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31945447316669) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 555969729 + ... + 556027184.

It is an arithmetic number, because the mean of its divisors is an integer number (833997685500).

Almost surely, 2^{31945447316664} is an apocalyptic number.

It is an amenable number.

31945447316664 is an abundant number, since it is smaller than the sum of its proper divisors (74806256427336).

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

31945447316664 is a wasteful number, since it uses less digits than its factorization.

31945447316664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111996954 (or 1111996944 counting only the distinct ones).

The product of its digits is 156764160, while the sum is 63.

The spelling of 31945447316664 in words is "thirty-one trillion, nine hundred forty-five billion, four hundred forty-seven million, three hundred sixteen thousand, six hundred sixty-four".