15681412031820 has 48 divisors (see below), whose sum is σ = 44929068898560. Its totient is φ = 4084460807616.

The previous prime is 15681412031809. The next prime is 15681412031839. The reversal of 15681412031820 is 2813021418651.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3039030760 + ... + 3039035919.

It is an arithmetic number, because the mean of its divisors is an integer number (936022268720).

Almost surely, 2^{15681412031820} is an apocalyptic number.

15681412031820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15681412031820 is an abundant number, since it is smaller than the sum of its proper divisors (29247656866740).

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

15681412031820 is a wasteful number, since it uses less digits than its factorization.

15681412031820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6078066734 (or 6078066732 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 42.

The spelling of 15681412031820 in words is "fifteen trillion, six hundred eighty-one billion, four hundred twelve million, thirty-one thousand, eight hundred twenty".