15786902879813 has 48 divisors (see below), whose sum is σ = 17876451482736. Its totient is φ = 13857718533120.

The previous prime is 15786902879809. The next prime is 15786902879821. The reversal of 15786902879813 is 31897820968751.

It can be written as a sum of positive squares in 8 ways, for example, as 3152020304449 + 12634882575364 = 1775393^2 + 3554558^2 .

It is not a de Polignac number, because 15786902879813 - 2² = 15786902879809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15786902879833) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 878163281 + ... + 878181257.

It is an arithmetic number, because the mean of its divisors is an integer number (372426072557).

Almost surely, 2^{15786902879813} is an apocalyptic number.

15786902879813 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

15786902879813 is a deficient number, since it is larger than the sum of its proper divisors (2089548602923).

15786902879813 is a wasteful number, since it uses less digits than its factorization.

15786902879813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18774 (or 18751 counting only the distinct ones).

The product of its (nonzero) digits is 365783040, while the sum is 74.

The spelling of 15786902879813 in words is "fifteen trillion, seven hundred eighty-six billion, nine hundred two million, eight hundred seventy-nine thousand, eight hundred thirteen".