811774181968 has 20 divisors (see below), whose sum is σ = 1572890839828. Its totient is φ = 405866868480.

The previous prime is 811774181963. The next prime is 811774181969. The reversal of 811774181968 is 869181477118.

It can be written as a sum of positive squares in 2 ways, for example, as 603772512784 + 208001669184 = 777028^2 + 456072^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (811774181963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 930063 + ... + 1577518.

Almost surely, 2^811774181968 is an apocalyptic number.

It is an amenable number.

811774181968 is a deficient number, since it is larger than the sum of its proper divisors (761116657860).

811774181968 is a wasteful number, since it uses less digits than its factorization.

811774181968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2527822 (or 2527816 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 61.

The spelling of 811774181968 in words is "eight hundred eleven billion, seven hundred seventy-four million, one hundred eighty-one thousand, nine hundred sixty-eight".