10989993877 has 4 divisors (see below), whose sum is σ = 11059993996. Its totient is φ = 10919993760.

The previous prime is 10989993829. The next prime is 10989993881. The reversal of 10989993877 is 77839998901.

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 1812545476 + 9177448401 = 42574^2 + 95799^2 .

It is a cyclic number.

It is not a de Polignac number, because 10989993877 - 2¹¹ = 10989991829 is a prime.

It is a super-2 number, since 2×10989993877² (a number of 21 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 (10989993827) 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, 34999824 + ... + 35000137.

It is an arithmetic number, because the mean of its divisors is an integer number (2764998499).

Almost surely, 2^10989993877 is an apocalyptic number.

It is an amenable number.

10989993877 is a deficient number, since it is larger than the sum of its proper divisors (70000119).

10989993877 is an equidigital number, since it uses as much as digits as its factorization.

10989993877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70000118.

The product of its (nonzero) digits is 61725888, while the sum is 70.

The spelling of 10989993877 in words is "ten billion, nine hundred eighty-nine million, nine hundred ninety-three thousand, eight hundred seventy-seven".