667072687 has 2 divisors, whose sum is σ = 667072688. Its totient is φ = 667072686.

The previous prime is 667072621. The next prime is 667072727. The reversal of 667072687 is 786270766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 667072687 - 2²³ = 658684079 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 667072687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667022687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333536343 + 333536344.

It is an arithmetic number, because the mean of its divisors is an integer number (333536344).

Almost surely, 2^667072687 is an apocalyptic number.

667072687 is a deficient number, since it is larger than the sum of its proper divisors (1).

667072687 is an equidigital number, since it uses as much as digits as its factorization.

667072687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1185408, while the sum is 49.

The square root of 667072687 is about 25827.7503278934. The cubic root of 667072687 is about 873.7577744612.

The spelling of 667072687 in words is "six hundred sixty-seven million, seventy-two thousand, six hundred eighty-seven".