16434776881 has 4 divisors (see below), whose sum is σ = 16475761764. Its totient is φ = 16393792000.

The previous prime is 16434776867. The next prime is 16434776893. The reversal of 16434776881 is 18867743461.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15987073600 + 447703281 = 126440^2 + 21159^2 .

It is a cyclic number.

It is not a de Polignac number, because 16434776881 - 2²¹ = 16432679729 is a prime.

It is a super-2 number, since 2×16434776881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16434776861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20491840 + ... + 20492641.

It is an arithmetic number, because the mean of its divisors is an integer number (4118940441).

Almost surely, 2^16434776881 is an apocalyptic number.

It is an amenable number.

16434776881 is a deficient number, since it is larger than the sum of its proper divisors (40984883).

16434776881 is an equidigital number, since it uses as much as digits as its factorization.

16434776881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40984882.

The product of its digits is 5419008, while the sum is 55.

The spelling of 16434776881 in words is "sixteen billion, four hundred thirty-four million, seven hundred seventy-six thousand, eight hundred eighty-one".