18178007820 has 48 divisors (see below), whose sum is σ = 58169626368. Its totient is φ = 4154973120.

The previous prime is 18178007803. The next prime is 18178007851. The reversal of 18178007820 is 2870087181.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21640066 + ... + 21640905.

It is an arithmetic number, because the mean of its divisors is an integer number (1211867216).

Almost surely, 2^18178007820 is an apocalyptic number.

18178007820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18178007820 is an abundant number, since it is smaller than the sum of its proper divisors (39991618548).

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

18178007820 is a wasteful number, since it uses less digits than its factorization.

18178007820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43280990 (or 43280988 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 42.

The spelling of 18178007820 in words is "eighteen billion, one hundred seventy-eight million, seven thousand, eight hundred twenty".