15646671985728 has 112 divisors (see below), whose sum is σ = 49369623505920. Its totient is φ = 4276109105664.

The previous prime is 15646671985709. The next prime is 15646671985829. The reversal of 15646671985728 is 82758917664651.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (112).

It is a self number, because there is not a number n which added to its sum of digits gives 15646671985728.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253053198 + ... + 253115021.

Almost surely, 2^{15646671985728} is an apocalyptic number.

It is an amenable number.

15646671985728 is an abundant number, since it is smaller than the sum of its proper divisors (33722951520192).

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

15646671985728 is a wasteful number, since it uses less digits than its factorization.

15646671985728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506168264 (or 506168254 counting only the distinct ones).

The product of its digits is 1219276800, while the sum is 75.

The spelling of 15646671985728 in words is "fifteen trillion, six hundred forty-six billion, six hundred seventy-one million, nine hundred eighty-five thousand, seven hundred twenty-eight".