31661534373 has 32 divisors (see below), whose sum is σ = 51293730816. Its totient is φ = 16979147328.

The previous prime is 31661534371. The next prime is 31661534413. The reversal of 31661534373 is 37343516613.

It is not a de Polignac number, because 31661534373 - 2¹ = 31661534371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31661534371) 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, 592815 + ... + 644012.

It is an arithmetic number, because the mean of its divisors is an integer number (1602929088).

Almost surely, 2^31661534373 is an apocalyptic number.

It is an amenable number.

31661534373 is a deficient number, since it is larger than the sum of its proper divisors (19632196443).

31661534373 is a wasteful number, since it uses less digits than its factorization.

31661534373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1236913.

The product of its digits is 408240, while the sum is 42.

The spelling of 31661534373 in words is "thirty-one billion, six hundred sixty-one million, five hundred thirty-four thousand, three hundred seventy-three".