665355585072 has 40 divisors (see below), whose sum is σ = 1734899155776. Its totient is φ = 219712434496.

The previous prime is 665355585007. The next prime is 665355585101. The reversal of 665355585072 is 270585553566.

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, 64768578 + ... + 64778849.

Almost surely, 2^665355585072 is an apocalyptic number.

It is an amenable number.

665355585072 is an abundant number, since it is smaller than the sum of its proper divisors (1069543570704).

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

665355585072 is a wasteful number, since it uses less digits than its factorization.

665355585072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129547545 (or 129547539 counting only the distinct ones).

The product of its (nonzero) digits is 37800000, while the sum is 57.

The spelling of 665355585072 in words is "six hundred sixty-five billion, three hundred fifty-five million, five hundred eighty-five thousand, seventy-two".