31680036477 has 6 divisors (see below), whose sum is σ = 45760052702. Its totient is φ = 21120024312.

The previous prime is 31680036467. The next prime is 31680036529. The reversal of 31680036477 is 77463008613.

It can be written as a sum of positive squares in only one way, i.e., 22623468921 + 9056567556 = 150411^2 + 95166^2 .

It is not a de Polignac number, because 31680036477 - 2⁶ = 31680036413 is a prime.

It is a super-2 number, since 2×31680036477² (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 (31680036467) 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, 1760002018 + ... + 1760002035.

Almost surely, 2^31680036477 is an apocalyptic number.

It is an amenable number.

31680036477 is a deficient number, since it is larger than the sum of its proper divisors (14080016225).

31680036477 is a wasteful number, since it uses less digits than its factorization.

31680036477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3520004059 (or 3520004056 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 45.

The spelling of 31680036477 in words is "thirty-one billion, six hundred eighty million, thirty-six thousand, four hundred seventy-seven".