665872776 has 24 divisors (see below), whose sum is σ = 1803405630. Its totient is φ = 221957568.

The previous prime is 665872771. The next prime is 665872789. The reversal of 665872776 is 677278566.

It can be written as a sum of positive squares in only one way, i.e., 656691876 + 9180900 = 25626^2 + 3030^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is not an unprimeable number, because it can be changed into a prime (665872771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4624045 + ... + 4624188.

Almost surely, 2^665872776 is an apocalyptic number.

It is an amenable number.

665872776 is an abundant number, since it is smaller than the sum of its proper divisors (1137532854).

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

665872776 is a wasteful number, since it uses less digits than its factorization.

665872776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9248245 (or 9248238 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 54.

The square root of 665872776 is about 25804.5107684684. The cubic root of 665872776 is about 873.2335633102.

The spelling of 665872776 in words is "six hundred sixty-five million, eight hundred seventy-two thousand, seven hundred seventy-six".