66715079 has 4 divisors (see below), whose sum is σ = 67654800. Its totient is φ = 65775360.

The previous prime is 66715063. The next prime is 66715093. The reversal of 66715079 is 97051766.

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 66715079 - 2⁴ = 66715063 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 (66715039) 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, 469754 + ... + 469895.

It is an arithmetic number, because the mean of its divisors is an integer number (16913700).

Almost surely, 2^66715079 is an apocalyptic number.

66715079 is a deficient number, since it is larger than the sum of its proper divisors (939721).

66715079 is an equidigital number, since it uses as much as digits as its factorization.

66715079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 939720.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 66715079 is about 8167.9299091018. The cubic root of 66715079 is about 405.5782604860.

The spelling of 66715079 in words is "sixty-six million, seven hundred fifteen thousand, seventy-nine".