18508561953 has 16 divisors (see below), whose sum is σ = 28213311360. Its totient is φ = 10572650496.

The previous prime is 18508561943. The next prime is 18508561961. The reversal of 18508561953 is 35916580581.

It is a happy number.

It is not a de Polignac number, because 18508561953 - 2⁶ = 18508561889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18508561896 and 18508561905.

It is not an unprimeable number, because it can be changed into a prime (18508561943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 90400 + ... + 212577.

It is an arithmetic number, because the mean of its divisors is an integer number (1763331960).

Almost surely, 2^18508561953 is an apocalyptic number.

It is an amenable number.

18508561953 is a deficient number, since it is larger than the sum of its proper divisors (9704749407).

18508561953 is a wasteful number, since it uses less digits than its factorization.

18508561953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305896.

The product of its (nonzero) digits is 1296000, while the sum is 51.

The spelling of 18508561953 in words is "eighteen billion, five hundred eight million, five hundred sixty-one thousand, nine hundred fifty-three".