18218877616 has 40 divisors (see below), whose sum is σ = 35802262080. Its totient is φ = 8979949056.

The previous prime is 18218877559. The next prime is 18218877623. The reversal of 18218877616 is 61677881281.

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, 814356 + ... + 836428.

It is an arithmetic number, because the mean of its divisors is an integer number (895056552).

Almost surely, 2^18218877616 is an apocalyptic number.

18218877616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18218877616 is a deficient number, since it is larger than the sum of its proper divisors (17583384464).

18218877616 is a wasteful number, since it uses less digits than its factorization.

18218877616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22813 (or 22807 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 55.

The spelling of 18218877616 in words is "eighteen billion, two hundred eighteen million, eight hundred seventy-seven thousand, six hundred sixteen".