12689849630845 has 4 divisors (see below), whose sum is σ = 15227819557020. Its totient is φ = 10151879704672.

The previous prime is 12689849630839. The next prime is 12689849630849. The reversal of 12689849630845 is 54803694898621.

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 3592791357156 + 9097058273689 = 1895466^2 + 3016133^2 .

It is a cyclic number.

It is not a de Polignac number, because 12689849630845 - 2³³ = 12681259696253 is a prime.

It is a super-2 number, since 2×12689849630845² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12689849630849) 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, 1268984963080 + ... + 1268984963089.

It is an arithmetic number, because the mean of its divisors is an integer number (3806954889255).

Almost surely, 2^{12689849630845} is an apocalyptic number.

It is an amenable number.

12689849630845 is a deficient number, since it is larger than the sum of its proper divisors (2537969926175).

12689849630845 is an equidigital number, since it uses as much as digits as its factorization.

12689849630845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2537969926174.

The product of its (nonzero) digits is 716636160, while the sum is 73.

The spelling of 12689849630845 in words is "twelve trillion, six hundred eighty-nine billion, eight hundred forty-nine million, six hundred thirty thousand, eight hundred forty-five".