66660015006565 has 8 divisors (see below), whose sum is σ = 79996452017688. Its totient is φ = 53325055998720.

The previous prime is 66660015006527. The next prime is 66660015006583. The reversal of 66660015006565 is 56560051006666.

It can be written as a sum of positive squares in 4 ways, for example, as 2360641727844 + 64299373278721 = 1536438^2 + 8018689^2 .

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

It is not a de Polignac number, because 66660015006565 - 2¹³ = 66660014998373 is a prime.

It is a Duffinian number.

It is a congruent 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, 369401592 + ... + 369582001.

It is an arithmetic number, because the mean of its divisors is an integer number (9999556502211).

Almost surely, 2^{66660015006565} is an apocalyptic number.

It is an amenable number.

66660015006565 is a deficient number, since it is larger than the sum of its proper divisors (13336437011123).

66660015006565 is a wasteful number, since it uses less digits than its factorization.

66660015006565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 739001639.

The product of its (nonzero) digits is 5832000, while the sum is 52.

The spelling of 66660015006565 in words is "sixty-six trillion, six hundred sixty billion, fifteen million, six thousand, five hundred sixty-five".