665707446720 has 112 divisors (see below), whose sum is σ = 2348467967520. Its totient is φ = 177521983488.

The previous prime is 665707446671. The next prime is 665707446727. The reversal of 665707446720 is 27644707566.

665707446720 is a `hidden beast` number, since 6 + 6 + 570 + 7 + 4 + 4 + 67 + 2 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665707446727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38516097 + ... + 38533376.

Almost surely, 2^665707446720 is an apocalyptic number.

665707446720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

665707446720 is an abundant number, since it is smaller than the sum of its proper divisors (1682760520800).

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

665707446720 is a wasteful number, since it uses less digits than its factorization.

665707446720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77049499 (or 77049483 counting only the distinct ones).

The product of its (nonzero) digits is 11854080, while the sum is 54.

The spelling of 665707446720 in words is "six hundred sixty-five billion, seven hundred seven million, four hundred forty-six thousand, seven hundred twenty".