12891299656780 has 96 divisors (see below), whose sum is σ = 28549450238400. Its totient is φ = 4876064759808.

The previous prime is 12891299656777. The next prime is 12891299656783. The reversal of 12891299656780 is 8765699219821.

It is an interprime number because it is at equal distance from previous prime (12891299656777) and next prime (12891299656783).

It is a super-2 number, since 2×12891299656780² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12891299656783) 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, 503376616 + ... + 503402224.

It is an arithmetic number, because the mean of its divisors is an integer number (297390106650).

Almost surely, 2^{12891299656780} is an apocalyptic number.

12891299656780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12891299656780 is an abundant number, since it is smaller than the sum of its proper divisors (15658150581620).

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

12891299656780 is a wasteful number, since it uses less digits than its factorization.

12891299656780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28043 (or 28041 counting only the distinct ones).

The product of its (nonzero) digits is 235146240, while the sum is 73.

The spelling of 12891299656780 in words is "twelve trillion, eight hundred ninety-one billion, two hundred ninety-nine million, six hundred fifty-six thousand, seven hundred eighty".