11661590838 has 64 divisors (see below), whose sum is σ = 25059456000. Its totient is φ = 3610892544.

The previous prime is 11661590761. The next prime is 11661590839. The reversal of 11661590838 is 83809516611.

11661590838 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11661590839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 470418 + ... + 494586.

It is an arithmetic number, because the mean of its divisors is an integer number (391554000).

Almost surely, 2^11661590838 is an apocalyptic number.

11661590838 is an abundant number, since it is smaller than the sum of its proper divisors (13397865162).

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

11661590838 is a wasteful number, since it uses less digits than its factorization.

11661590838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24309.

The product of its (nonzero) digits is 311040, while the sum is 48.

The spelling of 11661590838 in words is "eleven billion, six hundred sixty-one million, five hundred ninety thousand, eight hundred thirty-eight".