30685907818 has 16 divisors (see below), whose sum is σ = 46129430016. Its totient is φ = 15309468880.

The previous prime is 30685907797. The next prime is 30685907849. The reversal of 30685907818 is 81870958603.

It is a super-2 number, since 2×30685907818² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1802655 + ... + 1819597.

It is an arithmetic number, because the mean of its divisors is an integer number (2883089376).

Almost surely, 2^30685907818 is an apocalyptic number.

30685907818 is a deficient number, since it is larger than the sum of its proper divisors (15443522198).

30685907818 is a wasteful number, since it uses less digits than its factorization.

30685907818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18869.

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 30685907818 in words is "thirty billion, six hundred eighty-five million, nine hundred seven thousand, eight hundred eighteen".