665362070021 has 16 divisors (see below), whose sum is σ = 734302609920. Its totient is φ = 597856141680.

The previous prime is 665362070003. The next prime is 665362070027. The reversal of 665362070021 is 120070263566.

It is a cyclic number.

It is not a de Polignac number, because 665362070021 - 2²² = 665357875717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665362070027) 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, 127151 + ... + 1160556.

It is an arithmetic number, because the mean of its divisors is an integer number (45893913120).

Almost surely, 2^665362070021 is an apocalyptic number.

It is an amenable number.

665362070021 is a deficient number, since it is larger than the sum of its proper divisors (68940539899).

665362070021 is a wasteful number, since it uses less digits than its factorization.

665362070021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288264.

The product of its (nonzero) digits is 90720, while the sum is 38.

The spelling of 665362070021 in words is "six hundred sixty-five billion, three hundred sixty-two million, seventy thousand, twenty-one".