11617778889 has 10 divisors (see below), whose sum is σ = 17354953770. Its totient is φ = 7745185872.

The previous prime is 11617778873. The next prime is 11617778897. The reversal of 11617778889 is 98887771611.

11617778889 is a `hidden beast` number, since 1 + 1 + 617 + 7 + 7 + 8 + 8 + 8 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7433888400 + 4183890489 = 86220^2 + 64683^2 .

It is not a de Polignac number, because 11617778889 - 2⁴ = 11617778873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11617778899) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 71714604 + ... + 71714765.

It is an arithmetic number, because the mean of its divisors is an integer number (1735495377).

Almost surely, 2^11617778889 is an apocalyptic number.

It is an amenable number.

11617778889 is a deficient number, since it is larger than the sum of its proper divisors (5737174881).

11617778889 is an equidigital number, since it uses as much as digits as its factorization.

11617778889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143429381 (or 143429372 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 63.

The spelling of 11617778889 in words is "eleven billion, six hundred seventeen million, seven hundred seventy-eight thousand, eight hundred eighty-nine".