664665160 has 32 divisors (see below), whose sum is σ = 1505547000. Its totient is φ = 264079360.

The previous prime is 664665139. The next prime is 664665161. The reversal of 664665160 is 61566466.

It can be written as a sum of positive squares in 4 ways, for example, as 383298084 + 281367076 = 19578^2 + 16774^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (664665161) 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, 49801 + ... + 61720.

Almost surely, 2^664665160 is an apocalyptic number.

It is an amenable number.

664665160 is an abundant number, since it is smaller than the sum of its proper divisors (840881840).

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

664665160 is a wasteful number, since it uses less digits than its factorization.

664665160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111681 (or 111677 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 40.

The square root of 664665160 is about 25781.1008298715. The cubic root of 664665160 is about 872.7053498149.

The spelling of 664665160 in words is "six hundred sixty-four million, six hundred sixty-five thousand, one hundred sixty".