10861697812681 has 3 divisors (see below), whose sum is σ = 10861701108391. Its totient is φ = 10861694516972.

The previous prime is 10861697812639. The next prime is 10861697812753. The reversal of 10861697812681 is 18621879616801.

The square root of 10861697812681 is 3295709.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2222213322681 + 8639484490000 = 1490709^2 + 2939300^2 .

It is not a de Polignac number, because 10861697812681 - 2⁹ = 10861697812169 is a prime.

It is a super-2 number, since 2×10861697812681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10861697812621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1647855 + ... + 4943563.

Almost surely, 2^{10861697812681} is an apocalyptic number.

10861697812681 is the 3295709-th square number.

10861697812681 is the 1647855-th centered octagonal number.

It is an amenable number.

10861697812681 is a deficient number, since it is larger than the sum of its proper divisors (3295710).

10861697812681 is an frugal number, since it uses more digits than its factorization.

10861697812681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6591418 (or 3295709 counting only the distinct ones).

The product of its (nonzero) digits is 13934592, while the sum is 64.

Multiplying 10861697812681 by its sum of digits (64), we get a square (695148660011584 = 26365672²).

The spelling of 10861697812681 in words is "ten trillion, eight hundred sixty-one billion, six hundred ninety-seven million, eight hundred twelve thousand, six hundred eighty-one".