66916753 has 2 divisors, whose sum is σ = 66916754. Its totient is φ = 66916752.

The previous prime is 66916747. The next prime is 66916769. The reversal of 66916753 is 35761966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66048129 + 868624 = 8127^2 + 932^2 .

It is a cyclic number.

It is not a de Polignac number, because 66916753 - 2⁵ = 66916721 is a prime.

It is not a weakly prime, because it can be changed into another prime (66916723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33458376 + 33458377.

It is an arithmetic number, because the mean of its divisors is an integer number (33458377).

Almost surely, 2^66916753 is an apocalyptic number.

It is an amenable number.

66916753 is a deficient number, since it is larger than the sum of its proper divisors (1).

66916753 is an equidigital number, since it uses as much as digits as its factorization.

66916753 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 43.

The square root of 66916753 is about 8180.2660714674. The cubic root of 66916753 is about 405.9865255544.

The spelling of 66916753 in words is "sixty-six million, nine hundred sixteen thousand, seven hundred fifty-three".