665615384601 has 8 divisors (see below), whose sum is σ = 939692307744. Its totient is φ = 417641025600.

The previous prime is 665615384579. The next prime is 665615384627. The reversal of 665615384601 is 106483516566.

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

It is not a de Polignac number, because 665615384601 - 2⁶ = 665615384537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51), and also a Moran number because the ratio is a prime number: 13051282051 = 665615384601 / (6 + 6 + 5 + 6 + 1 + 5 + 3 + 8 + 4 + 6 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (665615384641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6525640975 + ... + 6525641076.

It is an arithmetic number, because the mean of its divisors is an integer number (117461538468).

Almost surely, 2^665615384601 is an apocalyptic number.

It is an amenable number.

665615384601 is a deficient number, since it is larger than the sum of its proper divisors (274076923143).

665615384601 is a wasteful number, since it uses less digits than its factorization.

665615384601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13051282071.

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 665615384601 in words is "six hundred sixty-five billion, six hundred fifteen million, three hundred eighty-four thousand, six hundred one".