194223562561 has 4 divisors (see below), whose sum is σ = 221969785792. Its totient is φ = 166477339332.

The previous prime is 194223562553. The next prime is 194223562571. The reversal of 194223562561 is 165265322491.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165265322491 = 125591 ⋅1315901.

It is a cyclic number.

It is not a de Polignac number, because 194223562561 - 2³ = 194223562553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (194223562571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13873111605 + ... + 13873111618.

It is an arithmetic number, because the mean of its divisors is an integer number (55492446448).

Almost surely, 2^194223562561 is an apocalyptic number.

It is an amenable number.

194223562561 is a deficient number, since it is larger than the sum of its proper divisors (27746223231).

194223562561 is an equidigital number, since it uses as much as digits as its factorization.

194223562561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27746223230.

The product of its digits is 777600, while the sum is 46.

The spelling of 194223562561 in words is "one hundred ninety-four billion, two hundred twenty-three million, five hundred sixty-two thousand, five hundred sixty-one".