12966368257 has 4 divisors (see below), whose sum is σ = 12970046020. Its totient is φ = 12962690496.

The previous prime is 12966368249. The next prime is 12966368267. The reversal of 12966368257 is 75286366921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2643605056 + 10322763201 = 51416^2 + 101601^2 .

It is a cyclic number.

It is not a de Polignac number, because 12966368257 - 2³ = 12966368249 is a prime.

It is a super-2 number, since 2×12966368257² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12966368198 and 12966368207.

It is not an unprimeable number, because it can be changed into a prime (12966368267) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1833588 + ... + 1840645.

It is an arithmetic number, because the mean of its divisors is an integer number (3242511505).

Almost surely, 2^12966368257 is an apocalyptic number.

It is an amenable number.

12966368257 is a deficient number, since it is larger than the sum of its proper divisors (3677763).

12966368257 is an equidigital number, since it uses as much as digits as its factorization.

12966368257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3677762.

The product of its digits is 6531840, while the sum is 55.

The spelling of 12966368257 in words is "twelve billion, nine hundred sixty-six million, three hundred sixty-eight thousand, two hundred fifty-seven".