665910066001 has 16 divisors (see below), whose sum is σ = 752923261440. Its totient is φ = 585606954240.

The previous prime is 665910065981. The next prime is 665910066037. The reversal of 665910066001 is 100660019566.

665910066001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 665910066001 - 2²¹ = 665907968849 is a prime.

It is a super-2 number, since 2×665910066001² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665910066091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21770691 + ... + 21801256.

It is an arithmetic number, because the mean of its divisors is an integer number (47057703840).

Almost surely, 2^665910066001 is an apocalyptic number.

It is an amenable number.

665910066001 is a deficient number, since it is larger than the sum of its proper divisors (87013195439).

665910066001 is a wasteful number, since it uses less digits than its factorization.

665910066001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43572024.

The product of its (nonzero) digits is 58320, while the sum is 40.

The spelling of 665910066001 in words is "six hundred sixty-five billion, nine hundred ten million, sixty-six thousand, one".