66924617 has 2 divisors, whose sum is σ = 66924618. Its totient is φ = 66924616.

The previous prime is 66924607. The next prime is 66924619. The reversal of 66924617 is 71642966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58537801 + 8386816 = 7651^2 + 2896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66924617 is a prime.

Together with 66924619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66924619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33462308 + 33462309.

It is an arithmetic number, because the mean of its divisors is an integer number (33462309).

Almost surely, 2^66924617 is an apocalyptic number.

It is an amenable number.

66924617 is a deficient number, since it is larger than the sum of its proper divisors (1).

66924617 is an equidigital number, since it uses as much as digits as its factorization.

66924617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108864, while the sum is 41.

The square root of 66924617 is about 8180.7467263081. The cubic root of 66924617 is about 406.0024286621.

The spelling of 66924617 in words is "sixty-six million, nine hundred twenty-four thousand, six hundred seventeen".