668332867 has 2 divisors, whose sum is σ = 668332868. Its totient is φ = 668332866.

The previous prime is 668332859. The next prime is 668332871. The reversal of 668332867 is 768233866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 668332867 - 2³ = 668332859 is a prime.

It is a super-2 number, since 2×668332867² = 893337642224879378, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 668332867.

It is not a weakly prime, because it can be changed into another prime (668332967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334166433 + 334166434.

It is an arithmetic number, because the mean of its divisors is an integer number (334166434).

Almost surely, 2^668332867 is an apocalyptic number.

668332867 is a deficient number, since it is larger than the sum of its proper divisors (1).

668332867 is an equidigital number, since it uses as much as digits as its factorization.

668332867 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 49.

The square root of 668332867 is about 25852.1346700809. The cubic root of 668332867 is about 874.3076392939.

Subtracting 668332867 from its reverse (768233866), we obtain a palindrome (99900999).

The spelling of 668332867 in words is "six hundred sixty-eight million, three hundred thirty-two thousand, eight hundred sixty-seven".