18177640268 has 12 divisors (see below), whose sum is σ = 31824735432. Its totient is φ = 9084858720.

The previous prime is 18177640259. The next prime is 18177640319. The reversal of 18177640268 is 86204677181.

It is a happy number.

It is a super-2 number, since 2×18177640268² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 980018 + ... + 998393.

It is an arithmetic number, because the mean of its divisors is an integer number (2652061286).

Almost surely, 2^18177640268 is an apocalyptic number.

It is an amenable number.

18177640268 is a deficient number, since it is larger than the sum of its proper divisors (13647095164).

18177640268 is a wasteful number, since it uses less digits than its factorization.

18177640268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980712 (or 1980710 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 50.

The spelling of 18177640268 in words is "eighteen billion, one hundred seventy-seven million, six hundred forty thousand, two hundred sixty-eight".