18369466561 has 4 divisors (see below), whose sum is σ = 18377807152. Its totient is φ = 18361125972.

The previous prime is 18369466559. The next prime is 18369466579. The reversal of 18369466561 is 16566496381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18369466561 - 2¹ = 18369466559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18369466541) 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, 4166991 + ... + 4171396.

It is an arithmetic number, because the mean of its divisors is an integer number (4594451788).

Almost surely, 2^18369466561 is an apocalyptic number.

It is an amenable number.

18369466561 is a deficient number, since it is larger than the sum of its proper divisors (8340591).

18369466561 is an equidigital number, since it uses as much as digits as its factorization.

18369466561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8340590.

The product of its digits is 5598720, while the sum is 55.

The spelling of 18369466561 in words is "eighteen billion, three hundred sixty-nine million, four hundred sixty-six thousand, five hundred sixty-one".