18081566465 has 8 divisors (see below), whose sum is σ = 21698696448. Its totient is φ = 14464708720.

The previous prime is 18081566407. The next prime is 18081566513. The reversal of 18081566465 is 56466518081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18081566465 - 2³⁴ = 901697281 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130994 + ... + 230916.

It is an arithmetic number, because the mean of its divisors is an integer number (2712337056).

Almost surely, 2^18081566465 is an apocalyptic number.

It is an amenable number.

18081566465 is a deficient number, since it is larger than the sum of its proper divisors (3617129983).

18081566465 is an equidigital number, since it uses as much as digits as its factorization.

18081566465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136119.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 18081566465 in words is "eighteen billion, eighty-one million, five hundred sixty-six thousand, four hundred sixty-five".