11939640064 has 144 divisors (see below), whose sum is σ = 26821073664. Its totient is φ = 5257728000.

The previous prime is 11939640029. The next prime is 11939640113. The reversal of 11939640064 is 46004693911.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 11939640064.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18283962 + ... + 18284614.

It is an arithmetic number, because the mean of its divisors is an integer number (186257456).

Almost surely, 2^11939640064 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 11939640064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13410536832).

11939640064 is an abundant number, since it is smaller than the sum of its proper divisors (14881433600).

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

11939640064 is a wasteful number, since it uses less digits than its factorization.

11939640064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874 (or 860 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The spelling of 11939640064 in words is "eleven billion, nine hundred thirty-nine million, six hundred forty thousand, sixty-four".