30991890651636 has 48 divisors (see below), whose sum is σ = 72411303444480. Its totient is φ = 10316794007520.

The previous prime is 30991890651517. The next prime is 30991890651661. The reversal of 30991890651636 is 63615609819903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45125365 + ... + 45807011.

It is an arithmetic number, because the mean of its divisors is an integer number (1508568821760).

Almost surely, 2^{30991890651636} is an apocalyptic number.

It is an amenable number.

30991890651636 is an abundant number, since it is smaller than the sum of its proper divisors (41419412792844).

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

30991890651636 is a wasteful number, since it uses less digits than its factorization.

30991890651636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686724 (or 686722 counting only the distinct ones).

The product of its (nonzero) digits is 56687040, while the sum is 66.

The spelling of 30991890651636 in words is "thirty trillion, nine hundred ninety-one billion, eight hundred ninety million, six hundred fifty-one thousand, six hundred thirty-six".