194144221923 has 32 divisors (see below), whose sum is σ = 261359904000. Its totient is φ = 128186634240.

The previous prime is 194144221883. The next prime is 194144221939. The reversal of 194144221923 is 329122441491.

It is a Cunningham number, because it is equal to 440618²-1.

It is not a de Polignac number, because 194144221923 - 2²⁰ = 194143173347 is a prime.

It is not an unprimeable number, because it can be changed into a prime (194144221223) 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 31 ways as a sum of consecutive naturals, for example, 219868440 + ... + 219869322.

It is an arithmetic number, because the mean of its divisors is an integer number (8167497000).

Almost surely, 2^194144221923 is an apocalyptic number.

194144221923 is a deficient number, since it is larger than the sum of its proper divisors (67215682077).

194144221923 is a wasteful number, since it uses less digits than its factorization.

194144221923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2339.

The product of its digits is 124416, while the sum is 42.

The spelling of 194144221923 in words is "one hundred ninety-four billion, one hundred forty-four million, two hundred twenty-one thousand, nine hundred twenty-three".