11866870840 has 64 divisors (see below), whose sum is σ = 29175953760. Its totient is φ = 4308088320.

The previous prime is 11866870783. The next prime is 11866870849. The reversal of 11866870840 is 4807866811.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11866870849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 247722 + ... + 291718.

Almost surely, 2^11866870840 is an apocalyptic number.

11866870840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11866870840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14587976880).

11866870840 is an abundant number, since it is smaller than the sum of its proper divisors (17309082920).

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

11866870840 is a wasteful number, since it uses less digits than its factorization.

11866870840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44632 (or 44628 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 49.

The spelling of 11866870840 in words is "eleven billion, eight hundred sixty-six million, eight hundred seventy thousand, eight hundred forty".