669967231 has 2 divisors, whose sum is σ = 669967232. Its totient is φ = 669967230.

The previous prime is 669967217. The next prime is 669967247. The reversal of 669967231 is 132769966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669967231 - 2²⁷ = 535749503 is a prime.

It is a super-2 number, since 2×669967231² = 897712181227614722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669967271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334983615 + 334983616.

It is an arithmetic number, because the mean of its divisors is an integer number (334983616).

Almost surely, 2^669967231 is an apocalyptic number.

669967231 is a deficient number, since it is larger than the sum of its proper divisors (1).

669967231 is an equidigital number, since it uses as much as digits as its factorization.

669967231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 49.

The square root of 669967231 is about 25883.7252148913. The cubic root of 669967231 is about 875.0197463843.

The spelling of 669967231 in words is "six hundred sixty-nine million, nine hundred sixty-seven thousand, two hundred thirty-one".