18180022640 has 40 divisors (see below), whose sum is σ = 45519982368. Its totient is φ = 6712623360.

The previous prime is 18180022639. The next prime is 18180022697. The reversal of 18180022640 is 4622008181.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 18180022597 and 18180022606.

It is a congruent number.

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, 8739356 + ... + 8741435.

Almost surely, 2^18180022640 is an apocalyptic number.

18180022640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18180022640 is an abundant number, since it is smaller than the sum of its proper divisors (27339959728).

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

18180022640 is a wasteful number, since it uses less digits than its factorization.

18180022640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17480817 (or 17480811 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The spelling of 18180022640 in words is "eighteen billion, one hundred eighty million, twenty-two thousand, six hundred forty".