12778694187771 has 32 divisors (see below), whose sum is σ = 18280857950208. Its totient is φ = 7924854654720.

The previous prime is 12778694187769. The next prime is 12778694187781. The reversal of 12778694187771 is 17778149687721.

It is not a de Polignac number, because 12778694187771 - 2¹ = 12778694187769 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12778694187693 and 12778694187702.

It is not an unprimeable number, because it can be changed into a prime (12778694187781) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22085826 + ... + 22657031.

It is an arithmetic number, because the mean of its divisors is an integer number (571276810944).

Almost surely, 2^{12778694187771} is an apocalyptic number.

12778694187771 is a deficient number, since it is larger than the sum of its proper divisors (5502163762437).

12778694187771 is a wasteful number, since it uses less digits than its factorization.

12778694187771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44743011.

The product of its digits is 464679936, while the sum is 75.

The spelling of 12778694187771 in words is "twelve trillion, seven hundred seventy-eight billion, six hundred ninety-four million, one hundred eighty-seven thousand, seven hundred seventy-one".