19145785623 has 4 divisors (see below), whose sum is σ = 25527714168. Its totient is φ = 12763857080.

The previous prime is 19145785591. The next prime is 19145785657. The reversal of 19145785623 is 32658754191.

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 19145785623 - 2⁵ = 19145785591 is a prime.

It is a super-2 number, since 2×19145785623² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19145785723) 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, 3190964268 + ... + 3190964273.

It is an arithmetic number, because the mean of its divisors is an integer number (6381928542).

Almost surely, 2^19145785623 is an apocalyptic number.

19145785623 is a deficient number, since it is larger than the sum of its proper divisors (6381928545).

19145785623 is an equidigital number, since it uses as much as digits as its factorization.

19145785623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6381928544.

The product of its digits is 1814400, while the sum is 51.

The spelling of 19145785623 in words is "nineteen billion, one hundred forty-five million, seven hundred eighty-five thousand, six hundred twenty-three".