18757559961 has 32 divisors (see below), whose sum is σ = 31765708800. Its totient is φ = 10716284880.

The previous prime is 18757559939. The next prime is 18757559969. The reversal of 18757559961 is 16995575781.

18757559961 is a `hidden beast` number, since 1 + 8 + 7 + 575 + 59 + 9 + 6 + 1 = 666.

It is not a de Polignac number, because 18757559961 - 2⁶ = 18757559897 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18757559969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1262506 + ... + 1277276.

It is an arithmetic number, because the mean of its divisors is an integer number (992678400).

Almost surely, 2^18757559961 is an apocalyptic number.

It is an amenable number.

18757559961 is a deficient number, since it is larger than the sum of its proper divisors (13008148839).

18757559961 is a wasteful number, since it uses less digits than its factorization.

18757559961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21506 (or 21500 counting only the distinct ones).

The product of its digits is 23814000, while the sum is 63.

The spelling of 18757559961 in words is "eighteen billion, seven hundred fifty-seven million, five hundred fifty-nine thousand, nine hundred sixty-one".