665188139768 has 96 divisors (see below), whose sum is σ = 1393614331200. Its totient is φ = 296483880960.

The previous prime is 665188139753. The next prime is 665188139813. The reversal of 665188139768 is 867931881566.

It is a super-2 number, since 2×665188139768² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (68).

It is a junction number, because it is equal to n+sod(n) for n = 665188139698 and 665188139707.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6088568 + ... + 6196856.

It is an arithmetic number, because the mean of its divisors is an integer number (14516815950).

Almost surely, 2^665188139768 is an apocalyptic number.

665188139768 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

665188139768 is an abundant number, since it is smaller than the sum of its proper divisors (728426191432).

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

665188139768 is a wasteful number, since it uses less digits than its factorization.

665188139768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108421 (or 108386 counting only the distinct ones).

The product of its digits is 104509440, while the sum is 68.

The spelling of 665188139768 in words is "six hundred sixty-five billion, one hundred eighty-eight million, one hundred thirty-nine thousand, seven hundred sixty-eight".