667401677 has 2 divisors, whose sum is σ = 667401678. Its totient is φ = 667401676.

The previous prime is 667401653. The next prime is 667401703. The reversal of 667401677 is 776104766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 542610436 + 124791241 = 23294^2 + 11171^2 .

It is a cyclic number.

It is not a de Polignac number, because 667401677 - 2⁸ = 667401421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667401577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333700838 + 333700839.

It is an arithmetic number, because the mean of its divisors is an integer number (333700839).

Almost surely, 2^667401677 is an apocalyptic number.

It is an amenable number.

667401677 is a deficient number, since it is larger than the sum of its proper divisors (1).

667401677 is an equidigital number, since it uses as much as digits as its factorization.

667401677 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 296352, while the sum is 44.

The square root of 667401677 is about 25834.1184676389. The cubic root of 667401677 is about 873.9013921570.

The spelling of 667401677 in words is "six hundred sixty-seven million, four hundred one thousand, six hundred seventy-seven".