15012781056 has 924 divisors, whose sum is σ = 58959200592. Its totient is φ = 3726508032.

The previous prime is 15012781051. The next prime is 15012781057. The reversal of 15012781056 is 65018721051.

15012781056 is a `hidden beast` number, since 1 + 501 + 27 + 81 + 0 + 56 = 666.

15012781056 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 15012781056.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15012781051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 883104760 + ... + 883104776.

Almost surely, 2^15012781056 is an apocalyptic number.

15012781056 is a gapful number since it is divisible by the number (16) 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 15012781056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29479600296).

15012781056 is an abundant number, since it is smaller than the sum of its proper divisors (43946419536).

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

15012781056 is an equidigital number, since it uses as much as digits as its factorization.

15012781056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 42 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The spelling of 15012781056 in words is "fifteen billion, twelve million, seven hundred eighty-one thousand, fifty-six".