12967849178778 has 32 divisors (see below), whose sum is σ = 27932720449536. Its totient is φ = 3989826243648.

The previous prime is 12967849178773. The next prime is 12967849178783. The reversal of 12967849178778 is 87787194876921.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12967849178773) and next prime (12967849178783).

It is a super-2 number, since 2×12967849178778² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12967849178778.

It is not an unprimeable number, because it can be changed into a prime (12967849178771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4743001 + ... + 6959292.

It is an arithmetic number, because the mean of its divisors is an integer number (872897514048).

Almost surely, 2^{12967849178778} is an apocalyptic number.

12967849178778 is an abundant number, since it is smaller than the sum of its proper divisors (14964871270758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12967849178778 is a wasteful number, since it uses less digits than its factorization.

12967849178778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11716518.

The product of its digits is 4779565056, while the sum is 84.

The spelling of 12967849178778 in words is "twelve trillion, nine hundred sixty-seven billion, eight hundred forty-nine million, one hundred seventy-eight thousand, seven hundred seventy-eight".