665313552 has 60 divisors (see below), whose sum is σ = 1864253820. Its totient is φ = 221497344.

The previous prime is 665313541. The next prime is 665313643. The reversal of 665313552 is 255313566.

It can be written as a sum of positive squares in 2 ways, for example, as 295289856 + 370023696 = 17184^2 + 19236^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 138324 + ... + 143052.

It is an arithmetic number, because the mean of its divisors is an integer number (31070897).

Almost surely, 2^665313552 is an apocalyptic number.

It is an amenable number.

665313552 is an abundant number, since it is smaller than the sum of its proper divisors (1198940268).

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

665313552 is a wasteful number, since it uses less digits than its factorization.

665313552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5720 (or 5711 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 665313552 is about 25793.6727125084. The cubic root of 665313552 is about 872.9890371513.

The spelling of 665313552 in words is "six hundred sixty-five million, three hundred thirteen thousand, five hundred fifty-two".