194399691797 has 4 divisors (see below), whose sum is σ = 194405482656. Its totient is φ = 194393900940.

The previous prime is 194399691781. The next prime is 194399691817. The reversal of 194399691797 is 797196993491.

It is a happy number.

194399691797 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is a cyclic number.

It is not a de Polignac number, because 194399691797 - 2⁴ = 194399691781 is a prime.

It is a super-4 number, since 4×194399691797⁴ (a number of 46 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194399691197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2844779 + ... + 2912312.

It is an arithmetic number, because the mean of its divisors is an integer number (48601370664).

Almost surely, 2^194399691797 is an apocalyptic number.

It is an amenable number.

194399691797 is a deficient number, since it is larger than the sum of its proper divisors (5790859).

194399691797 is an equidigital number, since it uses as much as digits as its factorization.

194399691797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5790858.

The product of its digits is 208324872, while the sum is 74.

The spelling of 194399691797 in words is "one hundred ninety-four billion, three hundred ninety-nine million, six hundred ninety-one thousand, seven hundred ninety-seven".