12778386361 has 8 divisors (see below), whose sum is σ = 13797654080. Its totient is φ = 11764306512.

The previous prime is 12778386353. The next prime is 12778386371. The reversal of 12778386361 is 16368387721.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12778386361 - 2³ = 12778386353 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12778386299 and 12778386308.

It is not an unprimeable number, because it can be changed into a prime (12778386371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1291845 + ... + 1301698.

It is an arithmetic number, because the mean of its divisors is an integer number (1724706760).

Almost surely, 2^12778386361 is an apocalyptic number.

It is an amenable number.

12778386361 is a deficient number, since it is larger than the sum of its proper divisors (1019267719).

12778386361 is a wasteful number, since it uses less digits than its factorization.

12778386361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593935.

The product of its digits is 2032128, while the sum is 52.

The spelling of 12778386361 in words is "twelve billion, seven hundred seventy-eight million, three hundred eighty-six thousand, three hundred sixty-one".