66916379 has 2 divisors, whose sum is σ = 66916380. Its totient is φ = 66916378.

The previous prime is 66916363. The next prime is 66916393. The reversal of 66916379 is 97361966.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66916379 - 2⁴ = 66916363 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (66912379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33458189 + 33458190.

It is an arithmetic number, because the mean of its divisors is an integer number (33458190).

Almost surely, 2^66916379 is an apocalyptic number.

66916379 is a deficient number, since it is larger than the sum of its proper divisors (1).

66916379 is an equidigital number, since it uses as much as digits as its factorization.

66916379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 367416, while the sum is 47.

The square root of 66916379 is about 8180.2432115433. The cubic root of 66916379 is about 405.9857691955.

The spelling of 66916379 in words is "sixty-six million, nine hundred sixteen thousand, three hundred seventy-nine".