16538878879 has 4 divisors (see below), whose sum is σ = 16819198920. Its totient is φ = 16258558840.

The previous prime is 16538878877. The next prime is 16538878897. The reversal of 16538878879 is 97887883561.

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 16538878879 - 2¹ = 16538878877 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 (16538878877) 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, 140159932 + ... + 140160049.

It is an arithmetic number, because the mean of its divisors is an integer number (4204799730).

Almost surely, 2^16538878879 is an apocalyptic number.

16538878879 is a deficient number, since it is larger than the sum of its proper divisors (280320041).

16538878879 is an equidigital number, since it uses as much as digits as its factorization.

16538878879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280320040.

The product of its digits is 162570240, while the sum is 70.

The spelling of 16538878879 in words is "sixteen billion, five hundred thirty-eight million, eight hundred seventy-eight thousand, eight hundred seventy-nine".