19487446723 has 4 divisors (see below), whose sum is σ = 19512657648. Its totient is φ = 19462235800.

The previous prime is 19487446673. The next prime is 19487446733. The reversal of 19487446723 is 32764478491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32764478491 = 31 ⋅1056918661.

It is a cyclic number.

It is not a de Polignac number, because 19487446723 - 2⁹ = 19487446211 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19487446733) 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, 12604303 + ... + 12605848.

It is an arithmetic number, because the mean of its divisors is an integer number (4878164412).

Almost surely, 2^19487446723 is an apocalyptic number.

19487446723 is a deficient number, since it is larger than the sum of its proper divisors (25210925).

19487446723 is an equidigital number, since it uses as much as digits as its factorization.

19487446723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25210924.

The product of its digits is 8128512, while the sum is 55.

The spelling of 19487446723 in words is "nineteen billion, four hundred eighty-seven million, four hundred forty-six thousand, seven hundred twenty-three".