665877637877178 has 8 divisors (see below), whose sum is σ = 1331755275754368. Its totient is φ = 221959212625724.

The previous prime is 665877637877149. The next prime is 665877637877201. The reversal of 665877637877178 is 871778736778566.

It is a sphenic number, since it is the product of 3 distinct primes.

665877637877178 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 665877637877091 and 665877637877100.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55489803156426 + ... + 55489803156437.

It is an arithmetic number, because the mean of its divisors is an integer number (166469409469296).

Almost surely, 2^{665877637877178} is an apocalyptic number.

665877637877178 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

665877637877178 is a wasteful number, since it uses less digits than its factorization.

665877637877178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110979606312868.

The product of its digits is 195165573120, while the sum is 93.

The spelling of 665877637877178 in words is "six hundred sixty-five trillion, eight hundred seventy-seven billion, six hundred thirty-seven million, eight hundred seventy-seven thousand, one hundred seventy-eight".