191286216851 has 16 divisors (see below), whose sum is σ = 211372416000. Its totient is φ = 172183659648.

The previous prime is 191286216791. The next prime is 191286216883. The reversal of 191286216851 is 158612682191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191286216851 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191286216851.

It is not an unprimeable number, because it can be changed into a prime (191286216551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3373190 + ... + 3429428.

It is an arithmetic number, because the mean of its divisors is an integer number (13210776000).

Almost surely, 2^191286216851 is an apocalyptic number.

191286216851 is a deficient number, since it is larger than the sum of its proper divisors (20086199149).

191286216851 is a wasteful number, since it uses less digits than its factorization.

191286216851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64978.

The product of its digits is 414720, while the sum is 50.

The spelling of 191286216851 in words is "one hundred ninety-one billion, two hundred eighty-six million, two hundred sixteen thousand, eight hundred fifty-one".