811205322077 has 4 divisors (see below), whose sum is σ = 839177919420. Its totient is φ = 783232724736.

The previous prime is 811205322047. The next prime is 811205322131. The reversal of 811205322077 is 770223502118.

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 359494977241 + 451710344836 = 599579^2 + 672094^2 .

It is a cyclic number.

It is not a de Polignac number, because 811205322077 - 2¹⁴ = 811205305693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 811205322077.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811205322047) 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, 13986298628 + ... + 13986298685.

It is an arithmetic number, because the mean of its divisors is an integer number (209794479855).

Almost surely, 2^811205322077 is an apocalyptic number.

It is an amenable number.

811205322077 is a deficient number, since it is larger than the sum of its proper divisors (27972597343).

811205322077 is a wasteful number, since it uses less digits than its factorization.

811205322077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27972597342.

The product of its (nonzero) digits is 47040, while the sum is 38.

The spelling of 811205322077 in words is "eight hundred eleven billion, two hundred five million, three hundred twenty-two thousand, seventy-seven".