15861871900011 has 8 divisors (see below), whose sum is σ = 21548203336080. Its totient is φ = 10375060865312.

The previous prime is 15861871900003. The next prime is 15861871900079. The reversal of 15861871900011 is 11000917816851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 15861871900011 - 2³ = 15861871900003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15861871900001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49880100156 + ... + 49880100473.

It is an arithmetic number, because the mean of its divisors is an integer number (2693525417010).

Almost surely, 2^{15861871900011} is an apocalyptic number.

15861871900011 is a deficient number, since it is larger than the sum of its proper divisors (5686331436069).

15861871900011 is an equidigital number, since it uses as much as digits as its factorization.

15861871900011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99760200685.

The product of its (nonzero) digits is 120960, while the sum is 48.

The spelling of 15861871900011 in words is "fifteen trillion, eight hundred sixty-one billion, eight hundred seventy-one million, nine hundred thousand, eleven".