816440012611 has 2 divisors, whose sum is σ = 816440012612. Its totient is φ = 816440012610.

The previous prime is 816440012551. The next prime is 816440012623. The reversal of 816440012611 is 116210044618.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816440012611 - 2²⁹ = 815903141699 is a prime.

It is not a weakly prime, because it can be changed into another prime (816440012911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408220006305 + 408220006306.

It is an arithmetic number, because the mean of its divisors is an integer number (408220006306).

Almost surely, 2^816440012611 is an apocalyptic number.

816440012611 is a deficient number, since it is larger than the sum of its proper divisors (1).

816440012611 is an equidigital number, since it uses as much as digits as its factorization.

816440012611 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 34.

The spelling of 816440012611 in words is "eight hundred sixteen billion, four hundred forty million, twelve thousand, six hundred eleven".