15781399914 has 192 divisors, whose sum is σ = 40609900800. Its totient is φ = 4058449920.

The previous prime is 15781399903. The next prime is 15781400023. The reversal of 15781399914 is 41999318751.

It is a happy number.

15781399914 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 95 ways as a sum of consecutive naturals, for example, 11279787 + ... + 11281185.

It is an arithmetic number, because the mean of its divisors is an integer number (211509900).

Almost surely, 2^15781399914 is an apocalyptic number.

15781399914 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 15781399914, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20304950400).

15781399914 is an abundant number, since it is smaller than the sum of its proper divisors (24828500886).

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

15781399914 is a wasteful number, since it uses less digits than its factorization.

15781399914 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1533 (or 1526 counting only the distinct ones).

The product of its digits is 2449440, while the sum is 57.

The spelling of 15781399914 in words is "fifteen billion, seven hundred eighty-one million, three hundred ninety-nine thousand, nine hundred fourteen".