665120784 has 60 divisors (see below), whose sum is σ = 1825284464. Its totient is φ = 208660992.

The previous prime is 665120777. The next prime is 665120791. The reversal of 665120784 is 487021566.

It is an interprime number because it is at equal distance from previous prime (665120777) and next prime (665120791).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10102 + ... + 37845.

Almost surely, 2^665120784 is an apocalyptic number.

It is an amenable number.

665120784 is an abundant number, since it is smaller than the sum of its proper divisors (1160163680).

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

665120784 is a wasteful number, since it uses less digits than its factorization.

665120784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47992 (or 47969 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 665120784 is about 25789.9357114360. The cubic root of 665120784 is about 872.9047157033.

The spelling of 665120784 in words is "six hundred sixty-five million, one hundred twenty thousand, seven hundred eighty-four".