665165065620 has 48 divisors (see below), whose sum is σ = 2031776929728. Its totient is φ = 161252136960.

The previous prime is 665165065601. The next prime is 665165065639. The reversal of 665165065620 is 26560561566.

It is an interprime number because it is at equal distance from previous prime (665165065601) and next prime (665165065639).

It is a self number, because there is not a number n which added to its sum of digits gives 665165065620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 503912269 + ... + 503913588.

It is an arithmetic number, because the mean of its divisors is an integer number (42328686036).

Almost surely, 2^665165065620 is an apocalyptic number.

665165065620 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665165065620 is an abundant number, since it is smaller than the sum of its proper divisors (1366611864108).

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

665165065620 is a wasteful number, since it uses less digits than its factorization.

665165065620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007825880 (or 1007825878 counting only the distinct ones).

The product of its (nonzero) digits is 1944000, while the sum is 48.

The spelling of 665165065620 in words is "six hundred sixty-five billion, one hundred sixty-five million, sixty-five thousand, six hundred twenty".