689659667 has 2 divisors, whose sum is σ = 689659668. Its totient is φ = 689659666.

The previous prime is 689659637. The next prime is 689659681. The reversal of 689659667 is 766956986.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 689659667 - 2¹⁶ = 689594131 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (689659627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 344829833 + 344829834.

It is an arithmetic number, because the mean of its divisors is an integer number (344829834).

Almost surely, 2^689659667 is an apocalyptic number.

689659667 is a deficient number, since it is larger than the sum of its proper divisors (1).

689659667 is an equidigital number, since it uses as much as digits as its factorization.

689659667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 29393280, while the sum is 62.

The square root of 689659667 is about 26261.3721461770. The cubic root of 689659667 is about 883.5102846959.

The spelling of 689659667 in words is "six hundred eighty-nine million, six hundred fifty-nine thousand, six hundred sixty-seven".