665355585138 has 32 divisors (see below), whose sum is σ = 1335256038720. Its totient is φ = 221028398400.

The previous prime is 665355585107. The next prime is 665355585173. The reversal of 665355585138 is 831585553566.

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, 3873828 + ... + 4041936.

It is an arithmetic number, because the mean of its divisors is an integer number (41726751210).

Almost surely, 2^665355585138 is an apocalyptic number.

665355585138 is an abundant number, since it is smaller than the sum of its proper divisors (669900453582).

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

665355585138 is a wasteful number, since it uses less digits than its factorization.

665355585138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170362.

The product of its digits is 64800000, while the sum is 60.

The spelling of 665355585138 in words is "six hundred sixty-five billion, three hundred fifty-five million, five hundred eighty-five thousand, one hundred thirty-eight".