11571159938 has 18 divisors (see below), whose sum is σ = 18797789097. Its totient is φ = 5339622600.

The previous prime is 11571159931. The next prime is 11571159959. The reversal of 11571159938 is 83995117511.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9893684089 + 1677475849 = 99467^2 + 40957^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=76063.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11571159931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1974713 + ... + 1980563.

Almost surely, 2^11571159938 is an apocalyptic number.

11571159938 is a deficient number, since it is larger than the sum of its proper divisors (7226629159).

11571159938 is an frugal number, since it uses more digits than its factorization.

11571159938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11730 (or 5866 counting only the distinct ones).

The product of its digits is 340200, while the sum is 50.

Multiplying 11571159938 by its sum of digits (50), we get a square (578557996900 = 760630²).

The spelling of 11571159938 in words is "eleven billion, five hundred seventy-one million, one hundred fifty-nine thousand, nine hundred thirty-eight".