669157667 has 2 divisors, whose sum is σ = 669157668. Its totient is φ = 669157666.

The previous prime is 669157633. The next prime is 669157693. The reversal of 669157667 is 766751966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669157667 - 2²² = 664963363 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (669157367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334578833 + 334578834.

It is an arithmetic number, because the mean of its divisors is an integer number (334578834).

Almost surely, 2^669157667 is an apocalyptic number.

669157667 is a deficient number, since it is larger than the sum of its proper divisors (1).

669157667 is an equidigital number, since it uses as much as digits as its factorization.

669157667 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2857680, while the sum is 53.

The square root of 669157667 is about 25868.0820123951. The cubic root of 669157667 is about 874.6671569971.

The spelling of 669157667 in words is "six hundred sixty-nine million, one hundred fifty-seven thousand, six hundred sixty-seven".