15794781012864 has 384 divisors, whose sum is σ = 53134776115200. Its totient is φ = 4410416812032.

The previous prime is 15794781012833. The next prime is 15794781012893. The reversal of 15794781012864 is 46821018749751.

15794781012864 is a `hidden beast` number, since 1 + 5 + 79 + 478 + 1 + 0 + 12 + 86 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68501482 + ... + 68731670.

It is an arithmetic number, because the mean of its divisors is an integer number (138371812800).

Almost surely, 2^{15794781012864} is an apocalyptic number.

15794781012864 is a gapful number since it is divisible by the number (14) 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 15794781012864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26567388057600).

15794781012864 is an abundant number, since it is smaller than the sum of its proper divisors (37339995102336).

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

15794781012864 is a wasteful number, since it uses less digits than its factorization.

15794781012864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230410 (or 230395 counting only the distinct ones).

The product of its (nonzero) digits is 27095040, while the sum is 63.

The spelling of 15794781012864 in words is "fifteen trillion, seven hundred ninety-four billion, seven hundred eighty-one million, twelve thousand, eight hundred sixty-four".