10689698881 has 3 divisors (see below), whose sum is σ = 10689802273. Its totient is φ = 10689595490.

The previous prime is 10689698879. The next prime is 10689698893. The reversal of 10689698881 is 18889698601.

The square root of 10689698881 is 103391.

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, and also an emirpimes, since its reverse is a distinct semiprime: 18889698601 = 27487 ⋅687223.

It is not a de Polignac number, because 10689698881 - 2¹ = 10689698879 is a prime.

It is a super-2 number, since 2×10689698881² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10689698581) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 51696 + ... + 155086.

Almost surely, 2^10689698881 is an apocalyptic number.

10689698881 is the 103391-st square number.

10689698881 is the 51696-th centered octagonal number.

It is an amenable number.

10689698881 is a deficient number, since it is larger than the sum of its proper divisors (103392).

10689698881 is an frugal number, since it uses more digits than its factorization.

10689698881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206782 (or 103391 counting only the distinct ones).

The product of its (nonzero) digits is 11943936, while the sum is 64.

Multiplying 10689698881 by its sum of digits (64), we get a square (684140728384 = 827128²).

The spelling of 10689698881 in words is "ten billion, six hundred eighty-nine million, six hundred ninety-eight thousand, eight hundred eighty-one".