66700613 has 12 divisors (see below), whose sum is σ = 77856300. Its totient is φ = 56976192.

The previous prime is 66700597. The next prime is 66700649. The reversal of 66700613 is 31600766.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 879844 + 65820769 = 938^2 + 8113^2 .

It is not a de Polignac number, because 66700613 - 2⁴ = 66700597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66700693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13163 + ... + 17511.

It is an arithmetic number, because the mean of its divisors is an integer number (6488025).

Almost surely, 2^66700613 is an apocalyptic number.

It is an amenable number.

66700613 is a deficient number, since it is larger than the sum of its proper divisors (11155687).

66700613 is a wasteful number, since it uses less digits than its factorization.

66700613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4676 (or 4669 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 66700613 is about 8167.0443246012. The cubic root of 66700613 is about 405.5489441789.

The spelling of 66700613 in words is "sixty-six million, seven hundred thousand, six hundred thirteen".