30999991866 has 16 divisors (see below), whose sum is σ = 63675659424. Its totient is φ = 10054051344.

The previous prime is 30999991853. The next prime is 30999991877. The reversal of 30999991866 is 66819999903.

It is a self number, because there is not a number n which added to its sum of digits gives 30999991866.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69819580 + ... + 69820023.

It is an arithmetic number, because the mean of its divisors is an integer number (3979728714).

Almost surely, 2^30999991866 is an apocalyptic number.

30999991866 is an abundant number, since it is smaller than the sum of its proper divisors (32675667558).

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

30999991866 is a wasteful number, since it uses less digits than its factorization.

30999991866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139639645.

The product of its (nonzero) digits is 51018336, while the sum is 69.

The spelling of 30999991866 in words is "thirty billion, nine hundred ninety-nine million, nine hundred ninety-one thousand, eight hundred sixty-six".