194991655823 has 2 divisors, whose sum is σ = 194991655824. Its totient is φ = 194991655822.

The previous prime is 194991655811. The next prime is 194991655849. The reversal of 194991655823 is 328556199491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194991655823 - 2¹⁰ = 194991654799 is a prime.

It is a super-4 number, since 4×194991655823⁴ (a number of 46 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194991655883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97495827911 + 97495827912.

It is an arithmetic number, because the mean of its divisors is an integer number (97495827912).

Almost surely, 2^194991655823 is an apocalyptic number.

194991655823 is a deficient number, since it is larger than the sum of its proper divisors (1).

194991655823 is an equidigital number, since it uses as much as digits as its factorization.

194991655823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20995200, while the sum is 62.

The spelling of 194991655823 in words is "one hundred ninety-four billion, nine hundred ninety-one million, six hundred fifty-five thousand, eight hundred twenty-three".