664553860 has 12 divisors (see below), whose sum is σ = 1395563148. Its totient is φ = 265821536.

The previous prime is 664553843. The next prime is 664553873. The reversal of 664553860 is 68355466.

It can be written as a sum of positive squares in 2 ways, for example, as 97732996 + 566820864 = 9886^2 + 23808^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 16613827 + ... + 16613866.

It is an arithmetic number, because the mean of its divisors is an integer number (116296929).

Almost surely, 2^664553860 is an apocalyptic number.

It is an amenable number.

664553860 is an abundant number, since it is smaller than the sum of its proper divisors (731009288).

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

664553860 is a wasteful number, since it uses less digits than its factorization.

664553860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33227702 (or 33227700 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 43.

The square root of 664553860 is about 25778.9421815559. The cubic root of 664553860 is about 872.6566347960.

The spelling of 664553860 in words is "six hundred sixty-four million, five hundred fifty-three thousand, eight hundred sixty".