66717413 has 4 divisors (see below), whose sum is σ = 76248480. Its totient is φ = 57186348.

The previous prime is 66717397. The next prime is 66717433. The reversal of 66717413 is 31471766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31471766 = 2 ⋅15735883.

It is a cyclic number.

It is not a de Polignac number, because 66717413 - 2⁴ = 66717397 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66717433) 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, 4765523 + ... + 4765536.

It is an arithmetic number, because the mean of its divisors is an integer number (19062120).

Almost surely, 2^66717413 is an apocalyptic number.

It is an amenable number.

66717413 is a deficient number, since it is larger than the sum of its proper divisors (9531067).

66717413 is an equidigital number, since it uses as much as digits as its factorization.

66717413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9531066.

The product of its digits is 21168, while the sum is 35.

The square root of 66717413 is about 8168.0727837110. The cubic root of 66717413 is about 405.5829900945.

The spelling of 66717413 in words is "sixty-six million, seven hundred seventeen thousand, four hundred thirteen".