31660016381 has 16 divisors (see below), whose sum is σ = 37527134208. Its totient is φ = 26137263600.

The previous prime is 31660016363. The next prime is 31660016383. The reversal of 31660016381 is 18361006613.

It is a happy number.

It is not a de Polignac number, because 31660016381 - 2²⁶ = 31592907517 is a prime.

It is a super-2 number, since 2×31660016381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31660016383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 299945 + ... + 391518.

It is an arithmetic number, because the mean of its divisors is an integer number (2345445888).

Almost surely, 2^31660016381 is an apocalyptic number.

31660016381 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31660016381 is a deficient number, since it is larger than the sum of its proper divisors (5867117827).

31660016381 is a wasteful number, since it uses less digits than its factorization.

31660016381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 691712.

The product of its (nonzero) digits is 15552, while the sum is 35.

The spelling of 31660016381 in words is "thirty-one billion, six hundred sixty million, sixteen thousand, three hundred eighty-one".