11563580978 has 4 divisors (see below), whose sum is σ = 17345371470. Its totient is φ = 5781790488.

The previous prime is 11563580957. The next prime is 11563580981. The reversal of 11563580978 is 87908536511.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11343741049 + 219839929 = 106507^2 + 14827^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2890895243 + ... + 2890895246.

Almost surely, 2^11563580978 is an apocalyptic number.

11563580978 is a deficient number, since it is larger than the sum of its proper divisors (5781790492).

11563580978 is an equidigital number, since it uses as much as digits as its factorization.

11563580978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5781790491.

The product of its (nonzero) digits is 1814400, while the sum is 53.

The spelling of 11563580978 in words is "eleven billion, five hundred sixty-three million, five hundred eighty thousand, nine hundred seventy-eight".