19864061923 has 4 divisors (see below), whose sum is σ = 20087253720. Its totient is φ = 19640870128.

The previous prime is 19864061911. The next prime is 19864061977. The reversal of 19864061923 is 32916046891.

It is a happy number.

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 19864061923 - 2¹³ = 19864053731 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 not an unprimeable number, because it can be changed into a prime (19864061123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111595765 + ... + 111595942.

It is an arithmetic number, because the mean of its divisors is an integer number (5021813430).

Almost surely, 2^19864061923 is an apocalyptic number.

19864061923 is a deficient number, since it is larger than the sum of its proper divisors (223191797).

19864061923 is an equidigital number, since it uses as much as digits as its factorization.

19864061923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223191796.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 19864061923 in words is "nineteen billion, eight hundred sixty-four million, sixty-one thousand, nine hundred twenty-three".