665427815372 has 6 divisors (see below), whose sum is σ = 1164498676908. Its totient is φ = 332713907684.

The previous prime is 665427815363. The next prime is 665427815389. The reversal of 665427815372 is 273518724566.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83178476918 + ... + 83178476925.

It is an arithmetic number, because the mean of its divisors is an integer number (194083112818).

Almost surely, 2^665427815372 is an apocalyptic number.

It is an amenable number.

665427815372 is a deficient number, since it is larger than the sum of its proper divisors (499070861536).

665427815372 is a wasteful number, since it uses less digits than its factorization.

665427815372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166356953847 (or 166356953845 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 56.

The spelling of 665427815372 in words is "six hundred sixty-five billion, four hundred twenty-seven million, eight hundred fifteen thousand, three hundred seventy-two".