15981540870 has 32 divisors (see below), whose sum is σ = 40374420480. Its totient is φ = 4037441760.

The previous prime is 15981540821. The next prime is 15981540901. The reversal of 15981540870 is 7804518951.

It is a happy number.

15981540870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 14018326 + ... + 14019465.

It is an arithmetic number, because the mean of its divisors is an integer number (1261700640).

Almost surely, 2^15981540870 is an apocalyptic number.

15981540870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

15981540870 is an abundant number, since it is smaller than the sum of its proper divisors (24392879610).

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

15981540870 is a wasteful number, since it uses less digits than its factorization.

15981540870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28037820.

The product of its (nonzero) digits is 403200, while the sum is 48.

The spelling of 15981540870 in words is "fifteen billion, nine hundred eighty-one million, five hundred forty thousand, eight hundred seventy".