11171531878 has 128 divisors (see below), whose sum is σ = 20879510400. Its totient is φ = 4425228288.

The previous prime is 11171531863. The next prime is 11171531909. The reversal of 11171531878 is 87813517111.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 48783868 + ... + 48784096.

It is an arithmetic number, because the mean of its divisors is an integer number (163121175).

Almost surely, 2^11171531878 is an apocalyptic number.

11171531878 is a deficient number, since it is larger than the sum of its proper divisors (9707978522).

11171531878 is a wasteful number, since it uses less digits than its factorization.

11171531878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474.

The product of its digits is 47040, while the sum is 43.

The spelling of 11171531878 in words is "eleven billion, one hundred seventy-one million, five hundred thirty-one thousand, eight hundred seventy-eight".