665630784001 has 4 divisors (see below), whose sum is σ = 667730565972. Its totient is φ = 663531002032.

The previous prime is 665630783977. The next prime is 665630784023. The reversal of 665630784001 is 100487036566.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 60228522225 + 605402261776 = 245415^2 + 778076^2 .

It is a cyclic number.

It is not a de Polignac number, because 665630784001 - 2²⁵ = 665597229569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (665630784031) 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, 1049890510 + ... + 1049891143.

It is an arithmetic number, because the mean of its divisors is an integer number (166932641493).

Almost surely, 2^665630784001 is an apocalyptic number.

It is an amenable number.

665630784001 is a deficient number, since it is larger than the sum of its proper divisors (2099781971).

665630784001 is a wasteful number, since it uses less digits than its factorization.

665630784001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2099781970.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 665630784001 in words is "six hundred sixty-five billion, six hundred thirty million, seven hundred eighty-four thousand, one".