31640868198 has 12 divisors (see below), whose sum is σ = 68555214468. Its totient is φ = 10546956060.

The previous prime is 31640868191. The next prime is 31640868211. The reversal of 31640868198 is 89186804613.

It is a super-2 number, since 2×31640868198² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31640868191) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 878912988 + ... + 878913023.

It is an arithmetic number, because the mean of its divisors is an integer number (5712934539).

Almost surely, 2^31640868198 is an apocalyptic number.

31640868198 is an abundant number, since it is smaller than the sum of its proper divisors (36914346270).

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

31640868198 is a wasteful number, since it uses less digits than its factorization.

31640868198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1757826019 (or 1757826016 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 54.

The spelling of 31640868198 in words is "thirty-one billion, six hundred forty million, eight hundred sixty-eight thousand, one hundred ninety-eight".