664513461 has 24 divisors (see below), whose sum is σ = 971493120. Its totient is φ = 437658336.

The previous prime is 664513457. The next prime is 664513481. The reversal of 664513461 is 164315466.

It is a happy number.

664513461 is a `hidden beast` number, since 6 + 645 + 1 + 3 + 4 + 6 + 1 = 666.

It is not a de Polignac number, because 664513461 - 2² = 664513457 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664513411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 666015 + ... + 667011.

It is an arithmetic number, because the mean of its divisors is an integer number (40478880).

Almost surely, 2^664513461 is an apocalyptic number.

It is an amenable number.

664513461 is a deficient number, since it is larger than the sum of its proper divisors (306979659).

664513461 is a wasteful number, since it uses less digits than its factorization.

664513461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825 (or 1822 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 664513461 is about 25778.1586037483. The cubic root of 664513461 is about 872.6389511679.

The spelling of 664513461 in words is "six hundred sixty-four million, five hundred thirteen thousand, four hundred sixty-one".