18161680668 has 24 divisors (see below), whose sum is σ = 42913678080. Its totient is φ = 5977261680.

The previous prime is 18161680643. The next prime is 18161680697. The reversal of 18161680668 is 86608616181.

It is a self number, because there is not a number n which added to its sum of digits gives 18161680668.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9577998 + ... + 9579893.

It is an arithmetic number, because the mean of its divisors is an integer number (1788069920).

Almost surely, 2^18161680668 is an apocalyptic number.

It is an amenable number.

18161680668 is an abundant number, since it is smaller than the sum of its proper divisors (24751997412).

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

18161680668 is a wasteful number, since it uses less digits than its factorization.

18161680668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19157977 (or 19157975 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 51.

The spelling of 18161680668 in words is "eighteen billion, one hundred sixty-one million, six hundred eighty thousand, six hundred sixty-eight".