19912723205 has 16 divisors (see below), whose sum is σ = 23965144704. Its totient is φ = 15883667520.

The previous prime is 19912723177. The next prime is 19912723211. The reversal of 19912723205 is 50232721991.

It is not a de Polignac number, because 19912723205 - 2²⁸ = 19644287749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2563187 + ... + 2570943.

It is an arithmetic number, because the mean of its divisors is an integer number (1497821544).

Almost surely, 2^19912723205 is an apocalyptic number.

It is an amenable number.

19912723205 is a deficient number, since it is larger than the sum of its proper divisors (4052421499).

19912723205 is an equidigital number, since it uses as much as digits as its factorization.

19912723205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9196.

The product of its (nonzero) digits is 68040, while the sum is 41.

The spelling of 19912723205 in words is "nineteen billion, nine hundred twelve million, seven hundred twenty-three thousand, two hundred five".