667956551 has 2 divisors, whose sum is σ = 667956552. Its totient is φ = 667956550.

The previous prime is 667956521. The next prime is 667956557. The reversal of 667956551 is 155659766.

667956551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-667956551 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 667956551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667956557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333978275 + 333978276.

It is an arithmetic number, because the mean of its divisors is an integer number (333978276).

Almost surely, 2^667956551 is an apocalyptic number.

667956551 is a deficient number, since it is larger than the sum of its proper divisors (1).

667956551 is an equidigital number, since it uses as much as digits as its factorization.

667956551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1701000, while the sum is 50.

The square root of 667956551 is about 25844.8554068310. The cubic root of 667956551 is about 874.1435106379.

The spelling of 667956551 in words is "six hundred sixty-seven million, nine hundred fifty-six thousand, five hundred fifty-one".