636996667 has 2 divisors, whose sum is σ = 636996668. Its totient is φ = 636996666.

The previous prime is 636996643. The next prime is 636996683. The reversal of 636996667 is 766699636.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 636996667 - 2¹⁹ = 636472379 is a prime.

It is not a weakly prime, because it can be changed into another prime (636996637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318498333 + 318498334.

It is an arithmetic number, because the mean of its divisors is an integer number (318498334).

Almost surely, 2^636996667 is an apocalyptic number.

636996667 is a deficient number, since it is larger than the sum of its proper divisors (1).

636996667 is an equidigital number, since it uses as much as digits as its factorization.

636996667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13226976, while the sum is 58.

The square root of 636996667 is about 25238.7928990275. The cubic root of 636996667 is about 860.4237442137.

The spelling of 636996667 in words is "six hundred thirty-six million, nine hundred ninety-six thousand, six hundred sixty-seven".