12778557119 has 4 divisors (see below), whose sum is σ = 12804796944. Its totient is φ = 12752317296.

The previous prime is 12778557109. The next prime is 12778557137. The reversal of 12778557119 is 91175587721.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12778557119 is a prime.

It is a super-2 number, since 2×12778557119² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12778557109) 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, 13119182 + ... + 13120155.

It is an arithmetic number, because the mean of its divisors is an integer number (3201199236).

Almost surely, 2^12778557119 is an apocalyptic number.

12778557119 is a deficient number, since it is larger than the sum of its proper divisors (26239825).

12778557119 is an equidigital number, since it uses as much as digits as its factorization.

12778557119 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26239824.

The product of its digits is 1234800, while the sum is 53.

The spelling of 12778557119 in words is "twelve billion, seven hundred seventy-eight million, five hundred fifty-seven thousand, one hundred nineteen".