16644243460723 has 4 divisors (see below), whose sum is σ = 16644604295088. Its totient is φ = 16643882626360.

The previous prime is 16644243460697. The next prime is 16644243460751. The reversal of 16644243460723 is 32706434244661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16644243460723 - 2²¹ = 16644241363571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16644243460423) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 180347983 + ... + 180440248.

It is an arithmetic number, because the mean of its divisors is an integer number (4161151073772).

Almost surely, 2^{16644243460723} is an apocalyptic number.

16644243460723 is a deficient number, since it is larger than the sum of its proper divisors (360834365).

16644243460723 is an equidigital number, since it uses as much as digits as its factorization.

16644243460723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360834364.

The product of its (nonzero) digits is 13934592, while the sum is 52.

The spelling of 16644243460723 in words is "sixteen trillion, six hundred forty-four billion, two hundred forty-three million, four hundred sixty thousand, seven hundred twenty-three".