11861973504 has 160 divisors (see below), whose sum is σ = 35195783040. Its totient is φ = 3944595456.

The previous prime is 11861973491. The next prime is 11861973509. The reversal of 11861973504 is 40537916811.

11861973504 is a `hidden beast` number, since 1 + 18 + 61 + 9 + 73 + 504 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 11861973504.

It is not an unprimeable number, because it can be changed into a prime (11861973509) 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, 8196909 + ... + 8198355.

It is an arithmetic number, because the mean of its divisors is an integer number (219973644).

Almost surely, 2^11861973504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11861973504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17597891520).

11861973504 is an abundant number, since it is smaller than the sum of its proper divisors (23333809536).

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

11861973504 is an equidigital number, since it uses as much as digits as its factorization.

11861973504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067 (or 2045 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The spelling of 11861973504 in words is "eleven billion, eight hundred sixty-one million, nine hundred seventy-three thousand, five hundred four".