18565056001 has 4 divisors (see below), whose sum is σ = 18574948692. Its totient is φ = 18555163312.

The previous prime is 18565055939. The next prime is 18565056007. The reversal of 18565056001 is 10065056581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10065056581 = 139 ⋅72410479.

It can be written as a sum of positive squares in 2 ways, for example, as 9334458225 + 9230597776 = 96615^2 + 96076^2 .

It is a cyclic number.

It is not a de Polignac number, because 18565056001 - 2²⁹ = 18028185089 is a prime.

It is a super-2 number, since 2×18565056001² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18565056007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4943530 + ... + 4947283.

It is an arithmetic number, because the mean of its divisors is an integer number (4643737173).

Almost surely, 2^18565056001 is an apocalyptic number.

It is an amenable number.

18565056001 is a deficient number, since it is larger than the sum of its proper divisors (9892691).

18565056001 is an equidigital number, since it uses as much as digits as its factorization.

18565056001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9892690.

The product of its (nonzero) digits is 36000, while the sum is 37.

The spelling of 18565056001 in words is "eighteen billion, five hundred sixty-five million, fifty-six thousand, one".