66513704 has 16 divisors (see below), whose sum is σ = 129014100. Its totient is φ = 32109952.

The previous prime is 66513703. The next prime is 66513719. The reversal of 66513704 is 40731566.

It can be written as a sum of positive squares in 2 ways, for example, as 66422500 + 91204 = 8150^2 + 302^2 .

It is not an unprimeable number, because it can be changed into a prime (66513703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143117 + ... + 143580.

Almost surely, 2^66513704 is an apocalyptic number.

It is an amenable number.

66513704 is a deficient number, since it is larger than the sum of its proper divisors (62500396).

66513704 is a wasteful number, since it uses less digits than its factorization.

66513704 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286732 (or 286728 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 66513704 is about 8155.5934180169. The cubic root of 66513704 is about 405.1697789420.

The spelling of 66513704 in words is "sixty-six million, five hundred thirteen thousand, seven hundred four".