16861868389 has 4 divisors (see below), whose sum is σ = 16862630400. Its totient is φ = 16861106380.

The previous prime is 16861868371. The next prime is 16861868411. The reversal of 16861868389 is 98386816861.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98386816861 = 19 ⋅5178253519.

It is a cyclic number.

It is not a de Polignac number, because 16861868389 - 2⁵ = 16861868357 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 16861868389.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16861868329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346789 + ... + 392410.

It is an arithmetic number, because the mean of its divisors is an integer number (4215657600).

Almost surely, 2^16861868389 is an apocalyptic number.

It is an amenable number.

16861868389 is a deficient number, since it is larger than the sum of its proper divisors (762011).

16861868389 is an equidigital number, since it uses as much as digits as its factorization.

16861868389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 762010.

The product of its digits is 23887872, while the sum is 64.

The spelling of 16861868389 in words is "sixteen billion, eight hundred sixty-one million, eight hundred sixty-eight thousand, three hundred eighty-nine".