66912877 has 2 divisors, whose sum is σ = 66912878. Its totient is φ = 66912876.

The previous prime is 66912847. The next prime is 66912887. The reversal of 66912877 is 77821966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56115081 + 10797796 = 7491^2 + 3286^2 .

It is a cyclic number.

It is not a de Polignac number, because 66912877 - 2¹⁵ = 66880109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66912847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33456438 + 33456439.

It is an arithmetic number, because the mean of its divisors is an integer number (33456439).

Almost surely, 2^66912877 is an apocalyptic number.

It is an amenable number.

66912877 is a deficient number, since it is larger than the sum of its proper divisors (1).

66912877 is an equidigital number, since it uses as much as digits as its factorization.

66912877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 66912877 is about 8180.0291564273. The cubic root of 66912877 is about 405.9786867892.

The spelling of 66912877 in words is "sixty-six million, nine hundred twelve thousand, eight hundred seventy-seven".