891211826768 has 20 divisors (see below), whose sum is σ = 1828294851060. Its totient is φ = 419393800704.

The previous prime is 891211826731. The next prime is 891211826777. The reversal of 891211826768 is 867628112198.

It can be written as a sum of positive squares in 2 ways, for example, as 787535554624 + 103676272144 = 887432^2 + 321988^2 .

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1638256763 + ... + 1638257306.

It is an arithmetic number, because the mean of its divisors is an integer number (91414742553).

Almost surely, 2^891211826768 is an apocalyptic number.

It is an amenable number.

891211826768 is an abundant number, since it is smaller than the sum of its proper divisors (937083024292).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

891211826768 is a wasteful number, since it uses less digits than its factorization.

891211826768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276514094 (or 3276514088 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 59.

The spelling of 891211826768 in words is "eight hundred ninety-one billion, two hundred eleven million, eight hundred twenty-six thousand, seven hundred sixty-eight".