665646884 has 24 divisors (see below), whose sum is σ = 1353121728. Its totient is φ = 280599840.

The previous prime is 665646881. The next prime is 665646913. The reversal of 665646884 is 488646566.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (665646881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 193154 + ... + 196569.

It is an arithmetic number, because the mean of its divisors is an integer number (56380072).

Almost surely, 2^665646884 is an apocalyptic number.

It is an amenable number.

665646884 is an abundant number, since it is smaller than the sum of its proper divisors (687474844).

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

665646884 is a wasteful number, since it uses less digits than its factorization.

665646884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389795 (or 389793 counting only the distinct ones).

The product of its digits is 6635520, while the sum is 53.

The square root of 665646884 is about 25800.1334105078. The cubic root of 665646884 is about 873.1348063137.

The spelling of 665646884 in words is "six hundred sixty-five million, six hundred forty-six thousand, eight hundred eighty-four".