669413472257 has 2 divisors, whose sum is σ = 669413472258. Its totient is φ = 669413472256.

The previous prime is 669413472223. The next prime is 669413472281. The reversal of 669413472257 is 752274314966.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 541307461696 + 128106010561 = 735736^2 + 357919^2 .

It is a cyclic number.

It is not a de Polignac number, because 669413472257 - 2²⁶ = 669346363393 is a prime.

It is a super-2 number, since 2×669413472257² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (669413471257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334706736128 + 334706736129.

It is an arithmetic number, because the mean of its divisors is an integer number (334706736129).

Almost surely, 2^669413472257 is an apocalyptic number.

It is an amenable number.

669413472257 is a deficient number, since it is larger than the sum of its proper divisors (1).

669413472257 is an equidigital number, since it uses as much as digits as its factorization.

669413472257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15240960, while the sum is 56.

The spelling of 669413472257 in words is "six hundred sixty-nine billion, four hundred thirteen million, four hundred seventy-two thousand, two hundred fifty-seven".