12778788779154 has 40 divisors (see below), whose sum is σ = 28783868686848. Its totient is φ = 4237294698360.

The previous prime is 12778788779153. The next prime is 12778788779189. The reversal of 12778788779154 is 45197788787721.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12778788779153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 206464902 + ... + 206526785.

Almost surely, 2^{12778788779154} is an apocalyptic number.

12778788779154 is an abundant number, since it is smaller than the sum of its proper divisors (16005079907694).

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

12778788779154 is a wasteful number, since it uses less digits than its factorization.

12778788779154 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412991892 (or 412991883 counting only the distinct ones).

The product of its digits is 3097866240, while the sum is 81.

The spelling of 12778788779154 in words is "twelve trillion, seven hundred seventy-eight billion, seven hundred eighty-eight million, seven hundred seventy-nine thousand, one hundred fifty-four".