18529779961 has 16 divisors (see below), whose sum is σ = 24106503168. Its totient is φ = 13811014800.

The previous prime is 18529779959. The next prime is 18529779977. The reversal of 18529779961 is 16997792581.

It is not a de Polignac number, because 18529779961 - 2¹ = 18529779959 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18529779893 and 18529779902.

It is not an unprimeable number, because it can be changed into a prime (18529779161) 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, 5229675 + ... + 5233216.

It is an arithmetic number, because the mean of its divisors is an integer number (1506656448).

Almost surely, 2^18529779961 is an apocalyptic number.

18529779961 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18529779961 is a deficient number, since it is larger than the sum of its proper divisors (5576723207).

18529779961 is a wasteful number, since it uses less digits than its factorization.

18529779961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10462932.

The product of its digits is 17146080, while the sum is 64.

The spelling of 18529779961 in words is "eighteen billion, five hundred twenty-nine million, seven hundred seventy-nine thousand, nine hundred sixty-one".