669718031 has 2 divisors, whose sum is σ = 669718032. Its totient is φ = 669718030.

The previous prime is 669717943. The next prime is 669718037. The reversal of 669718031 is 130817966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 669718031 - 2¹⁴ = 669701647 is a prime.

It is a super-2 number, since 2×669718031² = 897044482093033922, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 669718031.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669718037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334859015 + 334859016.

It is an arithmetic number, because the mean of its divisors is an integer number (334859016).

Almost surely, 2^669718031 is an apocalyptic number.

669718031 is a deficient number, since it is larger than the sum of its proper divisors (1).

669718031 is an equidigital number, since it uses as much as digits as its factorization.

669718031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 669718031 is about 25878.9109314901. The cubic root of 669718031 is about 874.9112425889.

The spelling of 669718031 in words is "six hundred sixty-nine million, seven hundred eighteen thousand, thirty-one".