30685680621 has 12 divisors (see below), whose sum is σ = 46250881248. Its totient is φ = 19567680264.

The previous prime is 30685680617. The next prime is 30685680653. The reversal of 30685680621 is 12608658603.

30685680621 is a `hidden beast` number, since 3 + 0 + 68 + 568 + 0 + 6 + 21 = 666.

It is not a de Polignac number, because 30685680621 - 2² = 30685680617 is a prime.

It is a super-2 number, since 2×30685680621² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30685680601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74119795 + ... + 74120208.

It is an arithmetic number, because the mean of its divisors is an integer number (3854240104).

Almost surely, 2^30685680621 is an apocalyptic number.

It is an amenable number.

30685680621 is a deficient number, since it is larger than the sum of its proper divisors (15565200627).

30685680621 is a wasteful number, since it uses less digits than its factorization.

30685680621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148240032 (or 148240029 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 30685680621 in words is "thirty billion, six hundred eighty-five million, six hundred eighty thousand, six hundred twenty-one".