11661187938 has 16 divisors (see below), whose sum is σ = 23891214816. Its totient is φ = 3792256160.

The previous prime is 11661187921. The next prime is 11661187939. The reversal of 11661187938 is 83978116611.

It is a super-3 number, since 3×11661187938³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (11661187939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23701356 + ... + 23701847.

It is an arithmetic number, because the mean of its divisors is an integer number (1493200926).

Almost surely, 2^11661187938 is an apocalyptic number.

11661187938 is an abundant number, since it is smaller than the sum of its proper divisors (12230026878).

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

11661187938 is a wasteful number, since it uses less digits than its factorization.

11661187938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47403249.

The product of its digits is 435456, while the sum is 51.

The spelling of 11661187938 in words is "eleven billion, six hundred sixty-one million, one hundred eighty-seven thousand, nine hundred thirty-eight".