66422879 has 4 divisors (see below), whose sum is σ = 69918840. Its totient is φ = 62926920.

The previous prime is 66422861. The next prime is 66422887. The reversal of 66422879 is 97822466.

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 66422879 - 2⁸ = 66422623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66422479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1747952 + ... + 1747989.

It is an arithmetic number, because the mean of its divisors is an integer number (17479710).

Almost surely, 2^66422879 is an apocalyptic number.

66422879 is a deficient number, since it is larger than the sum of its proper divisors (3495961).

66422879 is a wasteful number, since it uses less digits than its factorization.

66422879 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3495960.

The product of its digits is 290304, while the sum is 44.

The square root of 66422879 is about 8150.0232515006. The cubic root of 66422879 is about 404.9852740670.

The spelling of 66422879 in words is "sixty-six million, four hundred twenty-two thousand, eight hundred seventy-nine".