19181143943923 has 32 divisors (see below), whose sum is σ = 21492414720000. Its totient is φ = 16996366864512.

The previous prime is 19181143943921. The next prime is 19181143943993. The reversal of 19181143943923 is 32934934118191.

It is a cyclic number.

It is not a de Polignac number, because 19181143943923 - 2¹ = 19181143943921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19181143943921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 394008898 + ... + 394057576.

It is an arithmetic number, because the mean of its divisors is an integer number (671637960000).

Almost surely, 2^{19181143943923} is an apocalyptic number.

19181143943923 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

19181143943923 is a deficient number, since it is larger than the sum of its proper divisors (2311270776077).

19181143943923 is a wasteful number, since it uses less digits than its factorization.

19181143943923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54739.

The product of its digits is 5038848, while the sum is 58.

The spelling of 19181143943923 in words is "nineteen trillion, one hundred eighty-one billion, one hundred forty-three million, nine hundred forty-three thousand, nine hundred twenty-three".