15872687991 has 20 divisors (see below), whose sum is σ = 23715301104. Its totient is φ = 10579896000.

The previous prime is 15872687953. The next prime is 15872688011. The reversal of 15872687991 is 19978627851.

It is not a de Polignac number, because 15872687991 - 2⁶ = 15872687927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15872687291) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 549766 + ... + 577916.

Almost surely, 2^15872687991 is an apocalyptic number.

15872687991 is a deficient number, since it is larger than the sum of its proper divisors (7842613113).

15872687991 is an equidigital number, since it uses as much as digits as its factorization.

15872687991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35124 (or 35115 counting only the distinct ones).

The product of its digits is 15240960, while the sum is 63.

The spelling of 15872687991 in words is "fifteen billion, eight hundred seventy-two million, six hundred eighty-seven thousand, nine hundred ninety-one".