11663042778 has 24 divisors (see below), whose sum is σ = 25886267316. Its totient is φ = 3792859200.

The previous prime is 11663042753. The next prime is 11663042789. The reversal of 11663042778 is 87724036611.

11663042778 is a `hidden beast` number, since 1 + 1 + 6 + 630 + 4 + 2 + 7 + 7 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9129229209 + 2533813569 = 95547^2 + 50337^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7901053 + ... + 7902528.

Almost surely, 2^11663042778 is an apocalyptic number.

11663042778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11663042778 is an abundant number, since it is smaller than the sum of its proper divisors (14223224538).

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

11663042778 is a wasteful number, since it uses less digits than its factorization.

11663042778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15803630 (or 15803627 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 11663042778 in words is "eleven billion, six hundred sixty-three million, forty-two thousand, seven hundred seventy-eight".