11821707640 has 16 divisors (see below), whose sum is σ = 26598842280. Its totient is φ = 4728683040.

The previous prime is 11821707631. The next prime is 11821707691. The reversal of 11821707640 is 4670712811.

It is a self number, because there is not a number n which added to its sum of digits gives 11821707640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 147771306 + ... + 147771385.

Almost surely, 2^11821707640 is an apocalyptic number.

11821707640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11821707640 is an abundant number, since it is smaller than the sum of its proper divisors (14777134640).

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

11821707640 is a wasteful number, since it uses less digits than its factorization.

11821707640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295542702 (or 295542698 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 37.

The spelling of 11821707640 in words is "eleven billion, eight hundred twenty-one million, seven hundred seven thousand, six hundred forty".