669628633 has 2 divisors, whose sum is σ = 669628634. Its totient is φ = 669628632.

The previous prime is 669628607. The next prime is 669628649. The reversal of 669628633 is 336826966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404492544 + 265136089 = 20112^2 + 16283^2 .

It is a cyclic number.

It is not a de Polignac number, because 669628633 - 2²¹ = 667531481 is a prime.

It is a super-2 number, since 2×669628633² = 896805012266897378, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (669628133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334814316 + 334814317.

It is an arithmetic number, because the mean of its divisors is an integer number (334814317).

Almost surely, 2^669628633 is an apocalyptic number.

It is an amenable number.

669628633 is a deficient number, since it is larger than the sum of its proper divisors (1).

669628633 is an equidigital number, since it uses as much as digits as its factorization.

669628633 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1679616, while the sum is 49.

The square root of 669628633 is about 25877.1836373281. The cubic root of 669628633 is about 874.8723113809.

The spelling of 669628633 in words is "six hundred sixty-nine million, six hundred twenty-eight thousand, six hundred thirty-three".