15991012111201 has 12 divisors (see below), whose sum is σ = 16877507666304. Its totient is φ = 15148871019000.

The previous prime is 15991012111181. The next prime is 15991012111213. The reversal of 15991012111201 is 10211121019951.

It is not a de Polignac number, because 15991012111201 - 2²³ = 15991003722593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (15991012111601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10242376 + ... + 11699926.

It is an arithmetic number, because the mean of its divisors is an integer number (1406458972192).

Almost surely, 2^{15991012111201} is an apocalyptic number.

It is an amenable number.

15991012111201 is a deficient number, since it is larger than the sum of its proper divisors (886495555103).

15991012111201 is a wasteful number, since it uses less digits than its factorization.

15991012111201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1487980 (or 1487961 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 34.

The spelling of 15991012111201 in words is "fifteen trillion, nine hundred ninety-one billion, twelve million, one hundred eleven thousand, two hundred one".