11534681861 has 16 divisors (see below), whose sum is σ = 12939264000. Its totient is φ = 10230069168.

The previous prime is 11534681857. The next prime is 11534681867. The reversal of 11534681861 is 16818643511.

It is not a de Polignac number, because 11534681861 - 2² = 11534681857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11534681867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 260261 + ... + 301338.

It is an arithmetic number, because the mean of its divisors is an integer number (808704000).

Almost surely, 2^11534681861 is an apocalyptic number.

It is an amenable number.

11534681861 is a deficient number, since it is larger than the sum of its proper divisors (1404582139).

11534681861 is a wasteful number, since it uses less digits than its factorization.

11534681861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 561688.

The product of its digits is 138240, while the sum is 44.

The spelling of 11534681861 in words is "eleven billion, five hundred thirty-four million, six hundred eighty-one thousand, eight hundred sixty-one".