12655138860 has 864 divisors, whose sum is σ = 52319816640. Its totient is φ = 2445520896.

The previous prime is 12655138829. The next prime is 12655138877. The reversal of 12655138860 is 6883155621.

12655138860 is a `hidden beast` number, since 1 + 2 + 6 + 551 + 38 + 8 + 60 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 287 ways as a sum of consecutive naturals, for example, 80605902 + ... + 80606058.

Almost surely, 2^12655138860 is an apocalyptic number.

12655138860 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 12655138860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26159908320).

12655138860 is an abundant number, since it is smaller than the sum of its proper divisors (39664677780).

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

12655138860 is a wasteful number, since it uses less digits than its factorization.

12655138860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255 (or 243 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 12655138860 in words is "twelve billion, six hundred fifty-five million, one hundred thirty-eight thousand, eight hundred sixty".