667975277 has 2 divisors, whose sum is σ = 667975278. Its totient is φ = 667975276.

The previous prime is 667975261. The next prime is 667975279. The reversal of 667975277 is 772579766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 597851401 + 70123876 = 24451^2 + 8374^2 .

It is a cyclic number.

It is not a de Polignac number, because 667975277 - 2⁴ = 667975261 is a prime.

Together with 667975279, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667975279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333987638 + 333987639.

It is an arithmetic number, because the mean of its divisors is an integer number (333987639).

Almost surely, 2^667975277 is an apocalyptic number.

It is an amenable number.

667975277 is a deficient number, since it is larger than the sum of its proper divisors (1).

667975277 is an equidigital number, since it uses as much as digits as its factorization.

667975277 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7779240, while the sum is 56.

The square root of 667975277 is about 25845.2176814203. The cubic root of 667975277 is about 874.1516793621.

The spelling of 667975277 in words is "six hundred sixty-seven million, nine hundred seventy-five thousand, two hundred seventy-seven".