16881661439 has 4 divisors (see below), whose sum is σ = 16886548224. Its totient is φ = 16876774656.

The previous prime is 16881661429. The next prime is 16881661457. The reversal of 16881661439 is 93416618861.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16881661439 - 2⁸ = 16881661183 is a prime.

It is a super-3 number, since 3×16881661439³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16881661429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2438207 + ... + 2445120.

It is an arithmetic number, because the mean of its divisors is an integer number (4221637056).

Almost surely, 2^16881661439 is an apocalyptic number.

16881661439 is a deficient number, since it is larger than the sum of its proper divisors (4886785).

16881661439 is an equidigital number, since it uses as much as digits as its factorization.

16881661439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4886784.

The product of its digits is 1492992, while the sum is 53.

The spelling of 16881661439 in words is "sixteen billion, eight hundred eighty-one million, six hundred sixty-one thousand, four hundred thirty-nine".