15837478221872 has 20 divisors (see below), whose sum is σ = 31105458085320. Its totient is φ = 7810263232128.

The previous prime is 15837478221857. The next prime is 15837478221893. The reversal of 15837478221872 is 27812287473851.

15837478221872 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 15837478221799 and 15837478221808.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6779741222 + ... + 6779743557.

It is an arithmetic number, because the mean of its divisors is an integer number (1555272904266).

Almost surely, 2^{15837478221872} is an apocalyptic number.

It is an amenable number.

15837478221872 is a deficient number, since it is larger than the sum of its proper divisors (15267979863448).

15837478221872 is a wasteful number, since it uses less digits than its factorization.

15837478221872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13559484860 (or 13559484854 counting only the distinct ones).

The product of its digits is 84295680, while the sum is 65.

The spelling of 15837478221872 in words is "fifteen trillion, eight hundred thirty-seven billion, four hundred seventy-eight million, two hundred twenty-one thousand, eight hundred seventy-two".