664514660 has 24 divisors (see below), whose sum is σ = 1398181176. Its totient is φ = 265291520.

The previous prime is 664514621. The next prime is 664514707. The reversal of 664514660 is 66415466.

664514660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3407716 + 661106944 = 1846^2 + 25712^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21467 + ... + 42306.

It is an arithmetic number, because the mean of its divisors is an integer number (58257549).

Almost surely, 2^664514660 is an apocalyptic number.

It is an amenable number.

664514660 is an abundant number, since it is smaller than the sum of its proper divisors (733666516).

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

664514660 is a wasteful number, since it uses less digits than its factorization.

664514660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64303 (or 64301 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 664514660 is about 25778.1818598597. The cubic root of 664514660 is about 872.6394760098.

The spelling of 664514660 in words is "six hundred sixty-four million, five hundred fourteen thousand, six hundred sixty".