2123279646569 has 2 divisors, whose sum is σ = 2123279646570. Its totient is φ = 2123279646568.

The previous prime is 2123279646539. The next prime is 2123279646577. The reversal of 2123279646569 is 9656469723212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1707464890000 + 415814756569 = 1306700^2 + 644837^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123279646569 - 2²⁴ = 2123262869353 is a prime.

It is a super-2 number, since 2×2123279646569² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2123279646539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1061639823284 + 1061639823285.

It is an arithmetic number, because the mean of its divisors is an integer number (1061639823285).

Almost surely, 2^{2123279646569} is an apocalyptic number.

It is an amenable number.

2123279646569 is a deficient number, since it is larger than the sum of its proper divisors (1).

2123279646569 is an equidigital number, since it uses as much as digits as its factorization.

2123279646569 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58786560, while the sum is 62.

The spelling of 2123279646569 in words is "two trillion, one hundred twenty-three billion, two hundred seventy-nine million, six hundred forty-six thousand, five hundred sixty-nine".