11881578554 has 16 divisors (see below), whose sum is σ = 17880932520. Its totient is φ = 5921287680.

The previous prime is 11881578539. The next prime is 11881578557. The reversal of 11881578554 is 45587518811.

It can be written as a sum of positive squares in 4 ways, for example, as 10887879025 + 993699529 = 104345^2 + 31523^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11881578496 and 11881578505.

It is not an unprimeable number, because it can be changed into a prime (11881578557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1584494 + ... + 1591974.

Almost surely, 2^11881578554 is an apocalyptic number.

11881578554 is a deficient number, since it is larger than the sum of its proper divisors (5999353966).

11881578554 is a wasteful number, since it uses less digits than its factorization.

11881578554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9985.

The product of its digits is 1792000, while the sum is 53.

The spelling of 11881578554 in words is "eleven billion, eight hundred eighty-one million, five hundred seventy-eight thousand, five hundred fifty-four".