31871425166 has 12 divisors (see below), whose sum is σ = 54637873992. Its totient is φ = 13658895936.

The previous prime is 31871425133. The next prime is 31871425177. The reversal of 31871425166 is 66152417813.

It is a super-2 number, since 2×31871425166² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 644126 + ... + 691838.

It is an arithmetic number, because the mean of its divisors is an integer number (4553156166).

Almost surely, 2^31871425166 is an apocalyptic number.

31871425166 is a deficient number, since it is larger than the sum of its proper divisors (22766448826).

31871425166 is an frugal number, since it uses more digits than its factorization.

31871425166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95435 (or 47722 counting only the distinct ones).

The product of its digits is 241920, while the sum is 44.

The spelling of 31871425166 in words is "thirty-one billion, eight hundred seventy-one million, four hundred twenty-five thousand, one hundred sixty-six".