16723900643 has 4 divisors (see below), whose sum is σ = 17604105960. Its totient is φ = 15843695328.

The previous prime is 16723900597. The next prime is 16723900651. The reversal of 16723900643 is 34600932761.

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 16723900643 - 2¹⁸ = 16723638499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16723900643.

It is not an unprimeable number, because it can be changed into a prime (16723900043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 440102630 + ... + 440102667.

It is an arithmetic number, because the mean of its divisors is an integer number (4401026490).

Almost surely, 2^16723900643 is an apocalyptic number.

16723900643 is a deficient number, since it is larger than the sum of its proper divisors (880205317).

16723900643 is an equidigital number, since it uses as much as digits as its factorization.

16723900643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880205316.

The product of its (nonzero) digits is 163296, while the sum is 41.

The spelling of 16723900643 in words is "sixteen billion, seven hundred twenty-three million, nine hundred thousand, six hundred forty-three".