15681113819 has 32 divisors (see below), whose sum is σ = 18817843200. Its totient is φ = 13052231136.

The previous prime is 15681113813. The next prime is 15681113821. The reversal of 15681113819 is 91831118651.

It is a de Polignac number, because none of the positive numbers 2^k-15681113819 is a prime.

It is a super-2 number, since 2×15681113819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15681113819.

It is not an unprimeable number, because it can be changed into a prime (15681113813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9428582 + ... + 9430244.

It is an arithmetic number, because the mean of its divisors is an integer number (588057600).

Almost surely, 2^15681113819 is an apocalyptic number.

15681113819 is a deficient number, since it is larger than the sum of its proper divisors (3136729381).

15681113819 is an equidigital number, since it uses as much as digits as its factorization.

15681113819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2464 (or 2450 counting only the distinct ones).

The product of its digits is 51840, while the sum is 44.

The spelling of 15681113819 in words is "fifteen billion, six hundred eighty-one million, one hundred thirteen thousand, eight hundred nineteen".