15791378850 has 144 divisors (see below), whose sum is σ = 45745900200. Its totient is φ = 3882332160.

The previous prime is 15791378849. The next prime is 15791378861. The reversal of 15791378850 is 5887319751.

It is a happy number.

15791378850 is a `hidden beast` number, since 1 + 579 + 13 + 7 + 8 + 8 + 50 = 666.

It can be written as a sum of positive squares in 12 ways, for example, as 719151489 + 15072227361 = 26817^2 + 122769^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8358706 + ... + 8360594.

Almost surely, 2^15791378850 is an apocalyptic number.

15791378850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 15791378850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22872950100).

15791378850 is an abundant number, since it is smaller than the sum of its proper divisors (29954521350).

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

15791378850 is a wasteful number, since it uses less digits than its factorization.

15791378850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3349 (or 3341 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 54.

The spelling of 15791378850 in words is "fifteen billion, seven hundred ninety-one million, three hundred seventy-eight thousand, eight hundred fifty".