31972192866 has 96 divisors (see below), whose sum is σ = 74900142720. Its totient is φ = 9831773952.

The previous prime is 31972192831. The next prime is 31972192907. The reversal of 31972192866 is 66829127913.

It is a super-2 number, since 2×31972192866² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1282230 + ... + 1306926.

It is an arithmetic number, because the mean of its divisors is an integer number (780209820).

Almost surely, 2^31972192866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31972192866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37450071360).

31972192866 is an abundant number, since it is smaller than the sum of its proper divisors (42927949854).

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

31972192866 is a wasteful number, since it uses less digits than its factorization.

31972192866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24840 (or 24837 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 54.

The spelling of 31972192866 in words is "thirty-one billion, nine hundred seventy-two million, one hundred ninety-two thousand, eight hundred sixty-six".