10881439816 has 64 divisors (see below), whose sum is σ = 22731796080. Its totient is φ = 4850565120.

The previous prime is 10881439763. The next prime is 10881439819. The reversal of 10881439816 is 61893418801.

It can be written as a sum of positive squares in 8 ways, for example, as 4217982916 + 6663456900 = 64946^2 + 81630^2 .

It is a super-2 number, since 2×10881439816² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 10881439816.

It is not an unprimeable number, because it can be changed into a prime (10881439819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 516856 + ... + 537496.

Almost surely, 2^10881439816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 10881439816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11365898040).

10881439816 is an abundant number, since it is smaller than the sum of its proper divisors (11850356264).

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

10881439816 is a wasteful number, since it uses less digits than its factorization.

10881439816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20834 (or 20830 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 49.

The spelling of 10881439816 in words is "ten billion, eight hundred eighty-one million, four hundred thirty-nine thousand, eight hundred sixteen".