11721453644 has 12 divisors (see below), whose sum is σ = 20600582184. Its totient is φ = 5835573024.

The previous prime is 11721453589. The next prime is 11721453677. The reversal of 11721453644 is 44635412711.

It is a junction number, because it is equal to n+sod(n) for n = 11721453598 and 11721453607.

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, 6287402 + ... + 6289265.

It is an arithmetic number, because the mean of its divisors is an integer number (1716715182).

Almost surely, 2^11721453644 is an apocalyptic number.

It is an amenable number.

11721453644 is a deficient number, since it is larger than the sum of its proper divisors (8879128540).

11721453644 is a wasteful number, since it uses less digits than its factorization.

11721453644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12576904 (or 12576902 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The spelling of 11721453644 in words is "eleven billion, seven hundred twenty-one million, four hundred fifty-three thousand, six hundred forty-four".