66374779 has 2 divisors, whose sum is σ = 66374780. Its totient is φ = 66374778.

The previous prime is 66374767. The next prime is 66374807. The reversal of 66374779 is 97747366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66374779 - 2⁵ = 66374747 is a prime.

It is a super-2 number, since 2×66374779² = 8811222574597682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66374479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33187389 + 33187390.

It is an arithmetic number, because the mean of its divisors is an integer number (33187390).

Almost surely, 2^66374779 is an apocalyptic number.

66374779 is a deficient number, since it is larger than the sum of its proper divisors (1).

66374779 is an equidigital number, since it uses as much as digits as its factorization.

66374779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 49.

The square root of 66374779 is about 8147.0718052562. The cubic root of 66374779 is about 404.8874940252.

The spelling of 66374779 in words is "sixty-six million, three hundred seventy-four thousand, seven hundred seventy-nine".