31665617380 has 36 divisors (see below), whose sum is σ = 67942841148. Its totient is φ = 12396735040.

The previous prime is 31665617369. The next prime is 31665617449. The reversal of 31665617380 is 8371656613.

It can be written as a sum of positive squares in 2 ways, for example, as 11143335844 + 20522281536 = 105562^2 + 143256^2 .

It is a super-2 number, since 2×31665617380² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31665617380.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 314191 + ... + 402550.

It is an arithmetic number, because the mean of its divisors is an integer number (1887301143).

Almost surely, 2^31665617380 is an apocalyptic number.

It is an amenable number.

31665617380 is an abundant number, since it is smaller than the sum of its proper divisors (36277223768).

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

31665617380 is a wasteful number, since it uses less digits than its factorization.

31665617380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716844 (or 716795 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 46.

The spelling of 31665617380 in words is "thirty-one billion, six hundred sixty-five million, six hundred seventeen thousand, three hundred eighty".