665685042353188 has 36 divisors (see below), whose sum is σ = 1376131047763248. Its totient is φ = 279308409375840.

The previous prime is 665685042353183. The next prime is 665685042353189. The reversal of 665685042353188 is 881353240586566.

It is a super-2 number, since 2×665685042353188² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (665685042353183) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44760955606 + ... + 44760970477.

It is an arithmetic number, because the mean of its divisors is an integer number (38225862437868).

Almost surely, 2^{665685042353188} is an apocalyptic number.

It is an amenable number.

665685042353188 is an abundant number, since it is smaller than the sum of its proper divisors (710446005410060).

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

665685042353188 is a wasteful number, since it uses less digits than its factorization.

665685042353188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89521926124 (or 89521926109 counting only the distinct ones).

The product of its (nonzero) digits is 995328000, while the sum is 70.

The spelling of 665685042353188 in words is "six hundred sixty-five trillion, six hundred eighty-five billion, forty-two million, three hundred fifty-three thousand, one hundred eighty-eight".