19625944423 has 4 divisors (see below), whose sum is σ = 20780411760. Its totient is φ = 18471477088.

The previous prime is 19625944409. The next prime is 19625944451. The reversal of 19625944423 is 32444952691.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19625944423 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19625914423) 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, 577233643 + ... + 577233676.

It is an arithmetic number, because the mean of its divisors is an integer number (5195102940).

Almost surely, 2^19625944423 is an apocalyptic number.

19625944423 is a deficient number, since it is larger than the sum of its proper divisors (1154467337).

19625944423 is a wasteful number, since it uses less digits than its factorization.

19625944423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1154467336.

The product of its digits is 1866240, while the sum is 49.

The spelling of 19625944423 in words is "nineteen billion, six hundred twenty-five million, nine hundred forty-four thousand, four hundred twenty-three".