66442079 has 8 divisors (see below), whose sum is σ = 73125072. Its totient is φ = 59866240.

The previous prime is 66442073. The next prime is 66442093. The reversal of 66442079 is 97024466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66442079 - 2¹² = 66437983 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 (66442073) 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 7 ways as a sum of consecutive naturals, for example, 25484 + ... + 27969.

It is an arithmetic number, because the mean of its divisors is an integer number (9140634).

Almost surely, 2^66442079 is an apocalyptic number.

66442079 is a deficient number, since it is larger than the sum of its proper divisors (6682993).

66442079 is a wasteful number, since it uses less digits than its factorization.

66442079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53577.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 66442079 is about 8151.2010771419. The cubic root of 66442079 is about 405.0242915877.

The spelling of 66442079 in words is "sixty-six million, four hundred forty-two thousand, seventy-nine".