11918349640 has 64 divisors (see below), whose sum is σ = 28304020800. Its totient is φ = 4504211712.

The previous prime is 11918349623. The next prime is 11918349643. The reversal of 11918349640 is 4694381911.

It is not an unprimeable number, because it can be changed into a prime (11918349643) 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, 262459 + ... + 304501.

It is an arithmetic number, because the mean of its divisors is an integer number (442250325).

Almost surely, 2^11918349640 is an apocalyptic number.

11918349640 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 11918349640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14152010400).

11918349640 is an abundant number, since it is smaller than the sum of its proper divisors (16385671160).

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

11918349640 is a wasteful number, since it uses less digits than its factorization.

11918349640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42446 (or 42442 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 46.

The spelling of 11918349640 in words is "eleven billion, nine hundred eighteen million, three hundred forty-nine thousand, six hundred forty".