665126386464 has 48 divisors (see below), whose sum is σ = 1746461812032. Its totient is φ = 221644662528.

The previous prime is 665126386453. The next prime is 665126386481. The reversal of 665126386464 is 464683621566.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 667899 + ... + 1332794.

It is an arithmetic number, because the mean of its divisors is an integer number (36384621084).

Almost surely, 2^665126386464 is an apocalyptic number.

It is an amenable number.

665126386464 is an abundant number, since it is smaller than the sum of its proper divisors (1081335425568).

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

665126386464 is a wasteful number, since it uses less digits than its factorization.

665126386464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2004169 (or 2004161 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 57.

The spelling of 665126386464 in words is "six hundred sixty-five billion, one hundred twenty-six million, three hundred eighty-six thousand, four hundred sixty-four".