66979927 has 16 divisors (see below), whose sum is σ = 78520320. Its totient is φ = 55950048.

The previous prime is 66979903. The next prime is 66979931. The reversal of 66979927 is 72997966.

It is not a de Polignac number, because 66979927 - 2⁷ = 66979799 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 (66979027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51813 + ... + 53089.

It is an arithmetic number, because the mean of its divisors is an integer number (4907520).

Almost surely, 2^66979927 is an apocalyptic number.

66979927 is a deficient number, since it is larger than the sum of its proper divisors (11540393).

66979927 is a wasteful number, since it uses less digits than its factorization.

66979927 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1470.

The product of its digits is 2571912, while the sum is 55.

The square root of 66979927 is about 8184.1265263924. The cubic root of 66979927 is about 406.1142450704.

The spelling of 66979927 in words is "sixty-six million, nine hundred seventy-nine thousand, nine hundred twenty-seven".