31661060516540 has 96 divisors (see below), whose sum is σ = 81834079528320. Its totient is φ = 10019908002816.

The previous prime is 31661060516531. The next prime is 31661060516587. The reversal of 31661060516540 is 4561506016613.

It is a super-2 number, since 2×31661060516540² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31661060516491 and 31661060516500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66135074 + ... + 66612086.

It is an arithmetic number, because the mean of its divisors is an integer number (852438328420).

Almost surely, 2^{31661060516540} is an apocalyptic number.

It is an amenable number.

31661060516540 is an abundant number, since it is smaller than the sum of its proper divisors (50173019011780).

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

31661060516540 is a wasteful number, since it uses less digits than its factorization.

31661060516540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513511 (or 513509 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 44.

The spelling of 31661060516540 in words is "thirty-one trillion, six hundred sixty-one billion, sixty million, five hundred sixteen thousand, five hundred forty".