665601010665 has 16 divisors (see below), whose sum is σ = 1064986992576. Its totient is φ = 354978747200.

The previous prime is 665601010661. The next prime is 665601010691. The reversal of 665601010665 is 566010106566.

It is not a de Polignac number, because 665601010665 - 2² = 665601010661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665601010661) 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, 149950 + ... + 1163480.

It is an arithmetic number, because the mean of its divisors is an integer number (66561687036).

Almost surely, 2^665601010665 is an apocalyptic number.

It is an amenable number.

665601010665 is a deficient number, since it is larger than the sum of its proper divisors (399385981911).

665601010665 is a wasteful number, since it uses less digits than its factorization.

665601010665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1057320.

The product of its (nonzero) digits is 194400, while the sum is 42.

The spelling of 665601010665 in words is "six hundred sixty-five billion, six hundred one million, ten thousand, six hundred sixty-five".