66879047 has 2 divisors, whose sum is σ = 66879048. Its totient is φ = 66879046.

The previous prime is 66879019. The next prime is 66879053. The reversal of 66879047 is 74097866.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66879047 - 2⁶ = 66878983 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66878992 and 66879010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66879947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33439523 + 33439524.

It is an arithmetic number, because the mean of its divisors is an integer number (33439524).

Almost surely, 2^66879047 is an apocalyptic number.

66879047 is a deficient number, since it is larger than the sum of its proper divisors (1).

66879047 is an equidigital number, since it uses as much as digits as its factorization.

66879047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 66879047 is about 8177.9610539547. The cubic root of 66879047 is about 405.9102566412.

The spelling of 66879047 in words is "sixty-six million, eight hundred seventy-nine thousand, forty-seven".