12566934588978 has 256 divisors, whose sum is σ = 35351147520000. Its totient is φ = 3214220486400.

The previous prime is 12566934588977. The next prime is 12566934588979. The reversal of 12566934588978 is 87988543966521.

12566934588978 is a `hidden beast` number, since 1 + 2 + 5 + 6 + 6 + 93 + 458 + 8 + 9 + 78 = 666.

It is an interprime number because it is at equal distance from previous prime (12566934588977) and next prime (12566934588979).

It is a junction number, because it is equal to n+sod(n) for n = 12566934588897 and 12566934588906.

It is not an unprimeable number, because it can be changed into a prime (12566934588977) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 244710048 + ... + 244761396.

It is an arithmetic number, because the mean of its divisors is an integer number (138090420000).

Almost surely, 2^{12566934588978} is an apocalyptic number.

12566934588978 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12566934588978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17675573760000).

12566934588978 is an abundant number, since it is smaller than the sum of its proper divisors (22784212931022).

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

12566934588978 is a wasteful number, since it uses less digits than its factorization.

12566934588978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52278 (or 52272 counting only the distinct ones).

The product of its digits is 6270566400, while the sum is 81.

The spelling of 12566934588978 in words is "twelve trillion, five hundred sixty-six billion, nine hundred thirty-four million, five hundred eighty-eight thousand, nine hundred seventy-eight".