816811013409 has 32 divisors (see below), whose sum is σ = 1128217896960. Its totient is φ = 525308861952.

The previous prime is 816811013387. The next prime is 816811013449. The reversal of 816811013409 is 904310118618.

It is not a de Polignac number, because 816811013409 - 2¹¹ = 816811011361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816811013449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6026812 + ... + 6160850.

It is an arithmetic number, because the mean of its divisors is an integer number (35256809280).

Almost surely, 2^816811013409 is an apocalyptic number.

It is an amenable number.

816811013409 is a deficient number, since it is larger than the sum of its proper divisors (311406883551).

816811013409 is a wasteful number, since it uses less digits than its factorization.

816811013409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134669.

The product of its (nonzero) digits is 41472, while the sum is 42.

The spelling of 816811013409 in words is "eight hundred sixteen billion, eight hundred eleven million, thirteen thousand, four hundred nine".