66166979 has 2 divisors, whose sum is σ = 66166980. Its totient is φ = 66166978.

The previous prime is 66166973. The next prime is 66166993. The reversal of 66166979 is 97966166.

It is a happy number.

66166979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66166979 is a prime.

It is not a weakly prime, because it can be changed into another prime (66166973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33083489 + 33083490.

It is an arithmetic number, because the mean of its divisors is an integer number (33083490).

Almost surely, 2^66166979 is an apocalyptic number.

66166979 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166979 is an equidigital number, since it uses as much as digits as its factorization.

66166979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 50.

The square root of 66166979 is about 8134.3087598148. The cubic root of 66166979 is about 404.4645242522.

The spelling of 66166979 in words is "sixty-six million, one hundred sixty-six thousand, nine hundred seventy-nine".