16808520831 has 4 divisors (see below), whose sum is σ = 22411361112. Its totient is φ = 11205680552.

The previous prime is 16808520809. The next prime is 16808520847. The reversal of 16808520831 is 13802580861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13802580861 = 3 ⋅4600860287.

It is a cyclic number.

It is not a de Polignac number, because 16808520831 - 2⁶ = 16808520767 is a prime.

It is a super-2 number, since 2×16808520831² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16808520851) 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, 2801420136 + ... + 2801420141.

It is an arithmetic number, because the mean of its divisors is an integer number (5602840278).

Almost surely, 2^16808520831 is an apocalyptic number.

16808520831 is a deficient number, since it is larger than the sum of its proper divisors (5602840281).

16808520831 is an equidigital number, since it uses as much as digits as its factorization.

16808520831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5602840280.

The product of its (nonzero) digits is 92160, while the sum is 42.

The spelling of 16808520831 in words is "sixteen billion, eight hundred eight million, five hundred twenty thousand, eight hundred thirty-one".