669693851 has 2 divisors, whose sum is σ = 669693852. Its totient is φ = 669693850.

The previous prime is 669693841. The next prime is 669693887. The reversal of 669693851 is 158396966.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669693851 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 669693793 and 669693802.

It is not a weakly prime, because it can be changed into another prime (669693841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334846925 + 334846926.

It is an arithmetic number, because the mean of its divisors is an integer number (334846926).

Almost surely, 2^669693851 is an apocalyptic number.

669693851 is a deficient number, since it is larger than the sum of its proper divisors (1).

669693851 is an equidigital number, since it uses as much as digits as its factorization.

669693851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2099520, while the sum is 53.

The square root of 669693851 is about 25878.4437515087. The cubic root of 669693851 is about 874.9007129791.

The spelling of 669693851 in words is "six hundred sixty-nine million, six hundred ninety-three thousand, eight hundred fifty-one".