66670513 has 16 divisors (see below), whose sum is σ = 82494720. Its totient is φ = 52468416.

The previous prime is 66670501. The next prime is 66670529. The reversal of 66670513 is 31507666.

It is a happy number.

It is not a de Polignac number, because 66670513 - 2²⁵ = 33116081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66670013) 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 15 ways as a sum of consecutive naturals, for example, 16068 + ... + 19786.

It is an arithmetic number, because the mean of its divisors is an integer number (5155920).

Almost surely, 2^66670513 is an apocalyptic number.

It is an amenable number.

66670513 is a deficient number, since it is larger than the sum of its proper divisors (15824207).

66670513 is a wasteful number, since it uses less digits than its factorization.

66670513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3936.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 66670513 is about 8165.2013447312. The cubic root of 66670513 is about 405.4879309470.

The spelling of 66670513 in words is "sixty-six million, six hundred seventy thousand, five hundred thirteen".