18236672640 has 128 divisors (see below), whose sum is σ = 64588276800. Its totient is φ = 4863108096.

The previous prime is 18236672627. The next prime is 18236672669. The reversal of 18236672640 is 4627663281.

18236672640 is a `hidden beast` number, since 182 + 366 + 72 + 6 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (45).

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 15 ways as a sum of consecutive naturals, for example, 510402 + ... + 544961.

Almost surely, 2^18236672640 is an apocalyptic number.

18236672640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18236672640 is an abundant number, since it is smaller than the sum of its proper divisors (46351604160).

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

18236672640 is a wasteful number, since it uses less digits than its factorization.

18236672640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055391 (or 1055373 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 18236672640 in words is "eighteen billion, two hundred thirty-six million, six hundred seventy-two thousand, six hundred forty".