811961442599 has 4 divisors (see below), whose sum is σ = 811970288064. Its totient is φ = 811952597136.

The previous prime is 811961442577. The next prime is 811961442613. The reversal of 811961442599 is 995244169118.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-811961442599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811961442529) 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, 4283582 + ... + 4469115.

It is an arithmetic number, because the mean of its divisors is an integer number (202992572016).

Almost surely, 2^811961442599 is an apocalyptic number.

811961442599 is a deficient number, since it is larger than the sum of its proper divisors (8845465).

811961442599 is an equidigital number, since it uses as much as digits as its factorization.

811961442599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8845464.

The product of its digits is 5598720, while the sum is 59.

The spelling of 811961442599 in words is "eight hundred eleven billion, nine hundred sixty-one million, four hundred forty-two thousand, five hundred ninety-nine".