15872871585917 has 2 divisors, whose sum is σ = 15872871585918. Its totient is φ = 15872871585916.

The previous prime is 15872871585859. The next prime is 15872871585919. The reversal of 15872871585917 is 71958517827851.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11361894889081 + 4510976696836 = 3370741^2 + 2123906^2 .

It is an emirp because it is prime and its reverse (71958517827851) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-15872871585917 is a prime.

It is a super-3 number, since 3×15872871585917³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 15872871585919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15872871585919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7936435792958 + 7936435792959.

It is an arithmetic number, because the mean of its divisors is an integer number (7936435792959).

Almost surely, 2^{15872871585917} is an apocalyptic number.

It is an amenable number.

15872871585917 is a deficient number, since it is larger than the sum of its proper divisors (1).

15872871585917 is an equidigital number, since it uses as much as digits as its factorization.

15872871585917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136000, while the sum is 74.

The spelling of 15872871585917 in words is "fifteen trillion, eight hundred seventy-two billion, eight hundred seventy-one million, five hundred eighty-five thousand, nine hundred seventeen".