665170884644 has 24 divisors (see below), whose sum is σ = 1330371967680. Its totient is φ = 285066765216.

The previous prime is 665170884629. The next prime is 665170884659. The reversal of 665170884644 is 446488071566.

It is an interprime number because it is at equal distance from previous prime (665170884629) and next prime (665170884659).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1109687 + ... + 1600545.

It is an arithmetic number, because the mean of its divisors is an integer number (55432165320).

Almost surely, 2^665170884644 is an apocalyptic number.

It is an amenable number.

665170884644 is an abundant number, since it is smaller than the sum of its proper divisors (665201083036).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665170884644 is a wasteful number, since it uses less digits than its factorization.

665170884644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539267 (or 539265 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 59.

The spelling of 665170884644 in words is "six hundred sixty-five billion, one hundred seventy million, eight hundred eighty-four thousand, six hundred forty-four".