669676129 has 2 divisors, whose sum is σ = 669676130. Its totient is φ = 669676128.

The previous prime is 669676103. The next prime is 669676159. The reversal of 669676129 is 921676966.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 472975504 + 196700625 = 21748^2 + 14025^2 .

It is a cyclic number.

It is not a de Polignac number, because 669676129 - 2¹⁵ = 669643361 is a prime.

It is a super-2 number, since 2×669676129² = 896932235504849282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (669676159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334838064 + 334838065.

It is an arithmetic number, because the mean of its divisors is an integer number (334838065).

Almost surely, 2^669676129 is an apocalyptic number.

It is an amenable number.

669676129 is a deficient number, since it is larger than the sum of its proper divisors (1).

669676129 is an equidigital number, since it uses as much as digits as its factorization.

669676129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 52.

The square root of 669676129 is about 25878.1013407089. The cubic root of 669676129 is about 874.8929954591.

The spelling of 669676129 in words is "six hundred sixty-nine million, six hundred seventy-six thousand, one hundred twenty-nine".