66825079 has 4 divisors (see below), whose sum is σ = 70755984. Its totient is φ = 62894176.

The previous prime is 66825049. The next prime is 66825107. The reversal of 66825079 is 97052866.

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 66825079 - 2²⁵ = 33270647 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 (66825049) 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, 1965427 + ... + 1965460.

It is an arithmetic number, because the mean of its divisors is an integer number (17688996).

Almost surely, 2^66825079 is an apocalyptic number.

66825079 is a deficient number, since it is larger than the sum of its proper divisors (3930905).

66825079 is a wasteful number, since it uses less digits than its factorization.

66825079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3930904.

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 66825079 is about 8174.6607880694. The cubic root of 66825079 is about 405.8010442608.

The spelling of 66825079 in words is "sixty-six million, eight hundred twenty-five thousand, seventy-nine".