12678901349 has 4 divisors (see below), whose sum is σ = 12680595564. Its totient is φ = 12677207136.

The previous prime is 12678901321. The next prime is 12678901351. The reversal of 12678901349 is 94310987621.

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 8297388100 + 4381513249 = 91090^2 + 66193^2 .

It is a cyclic number.

It is not a de Polignac number, because 12678901349 - 2⁸ = 12678901093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12678901297 and 12678901306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12678900349) 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, 835832 + ... + 850865.

It is an arithmetic number, because the mean of its divisors is an integer number (3170148891).

Almost surely, 2^12678901349 is an apocalyptic number.

It is an amenable number.

12678901349 is a deficient number, since it is larger than the sum of its proper divisors (1694215).

12678901349 is an equidigital number, since it uses as much as digits as its factorization.

12678901349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1694214.

The product of its (nonzero) digits is 653184, while the sum is 50.

The spelling of 12678901349 in words is "twelve billion, six hundred seventy-eight million, nine hundred one thousand, three hundred forty-nine".