667634287 has 2 divisors, whose sum is σ = 667634288. Its totient is φ = 667634286.

The previous prime is 667634267. The next prime is 667634299. The reversal of 667634287 is 782436766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667634287 - 2⁷ = 667634159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667634287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667634257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333817143 + 333817144.

It is an arithmetic number, because the mean of its divisors is an integer number (333817144).

Almost surely, 2^667634287 is an apocalyptic number.

667634287 is a deficient number, since it is larger than the sum of its proper divisors (1).

667634287 is an equidigital number, since it uses as much as digits as its factorization.

667634287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 49.

The square root of 667634287 is about 25838.6200676429. The cubic root of 667634287 is about 874.0029075303.

The spelling of 667634287 in words is "six hundred sixty-seven million, six hundred thirty-four thousand, two hundred eighty-seven".