669134623 has 2 divisors, whose sum is σ = 669134624. Its totient is φ = 669134622.

The previous prime is 669134617. The next prime is 669134633. The reversal of 669134623 is 326431966.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 669134623 - 2¹⁷ = 669003551 is a prime.

It is a super-2 number, since 2×669134623² = 895482287394704258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (669134633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334567311 + 334567312.

It is an arithmetic number, because the mean of its divisors is an integer number (334567312).

Almost surely, 2^669134623 is an apocalyptic number.

669134623 is a deficient number, since it is larger than the sum of its proper divisors (1).

669134623 is an equidigital number, since it uses as much as digits as its factorization.

669134623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 40.

The square root of 669134623 is about 25867.6365947877. The cubic root of 669134623 is about 874.6571164828.

It can be divided in two parts, 6691 and 34623, that added together give a palindrome (41314).

The spelling of 669134623 in words is "six hundred sixty-nine million, one hundred thirty-four thousand, six hundred twenty-three".