66420379 has 2 divisors, whose sum is σ = 66420380. Its totient is φ = 66420378.

The previous prime is 66420317. The next prime is 66420391. The reversal of 66420379 is 97302466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66420379 - 2¹³ = 66412187 is a prime.

It is not a weakly prime, because it can be changed into another prime (66421379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33210189 + 33210190.

It is an arithmetic number, because the mean of its divisors is an integer number (33210190).

Almost surely, 2^66420379 is an apocalyptic number.

66420379 is a deficient number, since it is larger than the sum of its proper divisors (1).

66420379 is an equidigital number, since it uses as much as digits as its factorization.

66420379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 66420379 is about 8149.8698762618. The cubic root of 66420379 is about 404.9801931074.

The spelling of 66420379 in words is "sixty-six million, four hundred twenty thousand, three hundred seventy-nine".