16506876081 has 4 divisors (see below), whose sum is σ = 22009168112. Its totient is φ = 11004584052.

The previous prime is 16506876059. The next prime is 16506876109. The reversal of 16506876081 is 18067860561.

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.

It is not a de Polignac number, because 16506876081 - 2²¹ = 16504778929 is a prime.

It is a super-2 number, since 2×16506876081² (a number of 21 digits) contains 22 as substring.

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 16506876081.

It is not an unprimeable number, because it can be changed into a prime (16506876481) 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, 2751146011 + ... + 2751146016.

It is an arithmetic number, because the mean of its divisors is an integer number (5502292028).

Almost surely, 2^16506876081 is an apocalyptic number.

It is an amenable number.

16506876081 is a deficient number, since it is larger than the sum of its proper divisors (5502292031).

16506876081 is an equidigital number, since it uses as much as digits as its factorization.

16506876081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5502292030.

The product of its (nonzero) digits is 483840, while the sum is 48.

The spelling of 16506876081 in words is "sixteen billion, five hundred six million, eight hundred seventy-six thousand, eighty-one".