66725879 has 4 divisors (see below), whose sum is σ = 72791880. Its totient is φ = 60659880.

The previous prime is 66725863. The next prime is 66725899. The reversal of 66725879 is 97852766.

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 66725879 - 2⁴ = 66725863 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 (66725899) 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, 3032984 + ... + 3033005.

It is an arithmetic number, because the mean of its divisors is an integer number (18197970).

Almost surely, 2^66725879 is an apocalyptic number.

66725879 is a deficient number, since it is larger than the sum of its proper divisors (6066001).

66725879 is a wasteful number, since it uses less digits than its factorization.

66725879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6066000.

The product of its digits is 1270080, while the sum is 50.

The square root of 66725879 is about 8168.5910045736. The cubic root of 66725879 is about 405.6001446384.

The spelling of 66725879 in words is "sixty-six million, seven hundred twenty-five thousand, eight hundred seventy-nine".