12811655844 has 192 divisors, whose sum is σ = 38953824000. Its totient is φ = 3605575680.

The previous prime is 12811655833. The next prime is 12811655867. The reversal of 12811655844 is 44855611821.

12811655844 is a `hidden beast` number, since 1 + 2 + 8 + 1 + 1 + 65 + 584 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 12811655844.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 765324 + ... + 781884.

It is an arithmetic number, because the mean of its divisors is an integer number (202884500).

Almost surely, 2^12811655844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12811655844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19476912000).

12811655844 is an abundant number, since it is smaller than the sum of its proper divisors (26142168156).

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

12811655844 is a wasteful number, since it uses less digits than its factorization.

12811655844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16635 (or 16627 counting only the distinct ones).

The product of its digits is 307200, while the sum is 45.

The spelling of 12811655844 in words is "twelve billion, eight hundred eleven million, six hundred fifty-five thousand, eight hundred forty-four".