10891804685869 has 4 divisors (see below), whose sum is σ = 10895873349244. Its totient is φ = 10887736022496.

The previous prime is 10891804685849. The next prime is 10891804685887. The reversal of 10891804685869 is 96858640819801.

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 901432515844 + 9990372170025 = 949438^2 + 3160755^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-10891804685869 is a prime.

It is a super-2 number, since 2×10891804685869² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10891804685849) 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, 2034327672 + ... + 2034333025.

It is an arithmetic number, because the mean of its divisors is an integer number (2723968337311).

Almost surely, 2^{10891804685869} is an apocalyptic number.

It is an amenable number.

10891804685869 is a deficient number, since it is larger than the sum of its proper divisors (4068663375).

10891804685869 is an equidigital number, since it uses as much as digits as its factorization.

10891804685869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4068663374.

The product of its (nonzero) digits is 238878720, while the sum is 73.

The spelling of 10891804685869 in words is "ten trillion, eight hundred ninety-one billion, eight hundred four million, six hundred eighty-five thousand, eight hundred sixty-nine".