66879379 has 4 divisors (see below), whose sum is σ = 76433584. Its totient is φ = 57325176.

The previous prime is 66879361. The next prime is 66879401. The reversal of 66879379 is 97397866.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66879379 - 2⁷ = 66879251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66879349) 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 in 3 ways as a sum of consecutive naturals, for example, 4777092 + ... + 4777105.

It is an arithmetic number, because the mean of its divisors is an integer number (19108396).

Almost surely, 2^66879379 is an apocalyptic number.

66879379 is a deficient number, since it is larger than the sum of its proper divisors (9554205).

66879379 is an equidigital number, since it uses as much as digits as its factorization.

66879379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9554204.

The product of its digits is 3429216, while the sum is 55.

The square root of 66879379 is about 8177.9813523876. The cubic root of 66879379 is about 405.9109283113.

The spelling of 66879379 in words is "sixty-six million, eight hundred seventy-nine thousand, three hundred seventy-nine".