194071622557 has 2 divisors, whose sum is σ = 194071622558. Its totient is φ = 194071622556.

The previous prime is 194071622417. The next prime is 194071622567. The reversal of 194071622557 is 755226170491.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149721789721 + 44349832836 = 386939^2 + 210594^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194071622557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 194071622557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (194071622567) 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 as a sum of consecutive naturals, namely, 97035811278 + 97035811279.

It is an arithmetic number, because the mean of its divisors is an integer number (97035811279).

Almost surely, 2^194071622557 is an apocalyptic number.

It is an amenable number.

194071622557 is a deficient number, since it is larger than the sum of its proper divisors (1).

194071622557 is an equidigital number, since it uses as much as digits as its factorization.

194071622557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The spelling of 194071622557 in words is "one hundred ninety-four billion, seventy-one million, six hundred twenty-two thousand, five hundred fifty-seven".