18158322636 has 24 divisors (see below), whose sum is σ = 47077133040. Its totient is φ = 6052774176.

The previous prime is 18158322607. The next prime is 18158322641. The reversal of 18158322636 is 63622385181.

18158322636 is a `hidden beast` number, since 1 + 8 + 1 + 5 + 8 + 3 + 2 + 2 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 18158322591 and 18158322600.

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, 84066201 + ... + 84066416.

It is an arithmetic number, because the mean of its divisors is an integer number (1961547210).

Almost surely, 2^18158322636 is an apocalyptic number.

It is an amenable number.

18158322636 is an abundant number, since it is smaller than the sum of its proper divisors (28918810404).

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

18158322636 is a wasteful number, since it uses less digits than its factorization.

18158322636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168132630 (or 168132622 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The spelling of 18158322636 in words is "eighteen billion, one hundred fifty-eight million, three hundred twenty-two thousand, six hundred thirty-six".