16861354879 has 4 divisors (see below), whose sum is σ = 16881843376. Its totient is φ = 16840866384.

The previous prime is 16861354859. The next prime is 16861354891. The reversal of 16861354879 is 97845316861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97845316861 = 19 ⋅5149753519.

It is a cyclic number.

It is not a de Polignac number, because 16861354879 - 2¹³ = 16861346687 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 (16861354859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10243014 + ... + 10244659.

It is an arithmetic number, because the mean of its divisors is an integer number (4220460844).

Almost surely, 2^16861354879 is an apocalyptic number.

16861354879 is a deficient number, since it is larger than the sum of its proper divisors (20488497).

16861354879 is an equidigital number, since it uses as much as digits as its factorization.

16861354879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20488496.

The product of its digits is 8709120, while the sum is 58.

The spelling of 16861354879 in words is "sixteen billion, eight hundred sixty-one million, three hundred fifty-four thousand, eight hundred seventy-nine".