194426808997 has 2 divisors, whose sum is σ = 194426808998. Its totient is φ = 194426808996.

The previous prime is 194426808991. The next prime is 194426809067. The reversal of 194426808997 is 799808624491.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 119684170116 + 74742638881 = 345954^2 + 273391^2 .

It is an emirp because it is prime and its reverse (799808624491) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194426808997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194426808991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97213404498 + 97213404499.

It is an arithmetic number, because the mean of its divisors is an integer number (97213404499).

Almost surely, 2^194426808997 is an apocalyptic number.

It is an amenable number.

194426808997 is a deficient number, since it is larger than the sum of its proper divisors (1).

194426808997 is an equidigital number, since it uses as much as digits as its factorization.

194426808997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62705664, while the sum is 67.

The spelling of 194426808997 in words is "one hundred ninety-four billion, four hundred twenty-six million, eight hundred eight thousand, nine hundred ninety-seven".