665249360832 has 210 divisors, whose sum is σ = 2293968794832. Its totient is φ = 190071173376.

The previous prime is 665249360803. The next prime is 665249360851. The reversal of 665249360832 is 238063942566.

It is a happy number.

665249360832 is a `hidden beast` number, since 6 + 6 + 5 + 24 + 9 + 3 + 608 + 3 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1055448 + ... + 1563479.

Almost surely, 2^665249360832 is an apocalyptic number.

It is an amenable number.

665249360832 is an abundant number, since it is smaller than the sum of its proper divisors (1628719434000).

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

665249360832 is a wasteful number, since it uses less digits than its factorization.

665249360832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2618965 (or 2618939 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 54.

The spelling of 665249360832 in words is "six hundred sixty-five billion, two hundred forty-nine million, three hundred sixty thousand, eight hundred thirty-two".