11721459645 has 32 divisors (see below), whose sum is σ = 23815031040. Its totient is φ = 5358381120.

The previous prime is 11721459599. The next prime is 11721459647. The reversal of 11721459645 is 54695412711.

11721459645 is a `hidden beast` number, since 1 + 1 + 7 + 2 + 14 + 596 + 45 = 666.

It is not a de Polignac number, because 11721459645 - 2¹⁰ = 11721458621 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11721459645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11721459647) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6200886 + ... + 6202775.

It is an arithmetic number, because the mean of its divisors is an integer number (744219720).

Almost surely, 2^11721459645 is an apocalyptic number.

11721459645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11721459645 is an abundant number, since it is smaller than the sum of its proper divisors (12093571395).

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

11721459645 is a wasteful number, since it uses less digits than its factorization.

11721459645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12403682 (or 12403676 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The spelling of 11721459645 in words is "eleven billion, seven hundred twenty-one million, four hundred fifty-nine thousand, six hundred forty-five".