11988564858 has 24 divisors (see below), whose sum is σ = 26007846228. Its totient is φ = 3991169472.

The previous prime is 11988564853. The next prime is 11988564859. The reversal of 11988564858 is 85846588911.

11988564858 is a `hidden beast` number, since 1 + 19 + 8 + 8 + 564 + 8 + 58 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11612864169 + 375700689 = 107763^2 + 19383^2 .

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 11988564795 and 11988564804.

It is not an unprimeable number, because it can be changed into a prime (11988564851) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 403491 + ... + 432182.

Almost surely, 2^11988564858 is an apocalyptic number.

11988564858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11988564858 is an abundant number, since it is smaller than the sum of its proper divisors (14019281370).

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

11988564858 is a wasteful number, since it uses less digits than its factorization.

11988564858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836478 (or 836475 counting only the distinct ones).

The product of its digits is 22118400, while the sum is 63.

The spelling of 11988564858 in words is "eleven billion, nine hundred eighty-eight million, five hundred sixty-four thousand, eight hundred fifty-eight".