12996771840 has 544 divisors, whose sum is σ = 50205435840. Its totient is φ = 3170893824.

The previous prime is 12996771839. The next prime is 12996771841. The reversal of 12996771840 is 4817769921.

It is an interprime number because it is at equal distance from previous prime (12996771839) and next prime (12996771841).

It is a super-2 number, since 2×12996771840² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (12996771841) 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, 115015624 + ... + 115015736.

Almost surely, 2^12996771840 is an apocalyptic number.

12996771840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12996771840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25102717920).

12996771840 is an abundant number, since it is smaller than the sum of its proper divisors (37208664000).

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

12996771840 is an equidigital number, since it uses as much as digits as its factorization.

12996771840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 54.

The spelling of 12996771840 in words is "twelve billion, nine hundred ninety-six million, seven hundred seventy-one thousand, eight hundred forty".