194168668553 has 2 divisors, whose sum is σ = 194168668554. Its totient is φ = 194168668552.

The previous prime is 194168668517. The next prime is 194168668583. The reversal of 194168668553 is 355866861491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191238286864 + 2930381689 = 437308^2 + 54133^2 .

It is a cyclic number.

It is not a de Polignac number, because 194168668553 - 2²⁸ = 193900233097 is a prime.

It is a super-3 number, since 3×194168668553³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (194168668583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97084334276 + 97084334277.

It is an arithmetic number, because the mean of its divisors is an integer number (97084334277).

Almost surely, 2^194168668553 is an apocalyptic number.

It is an amenable number.

194168668553 is a deficient number, since it is larger than the sum of its proper divisors (1).

194168668553 is an equidigital number, since it uses as much as digits as its factorization.

194168668553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37324800, while the sum is 62.

The spelling of 194168668553 in words is "one hundred ninety-four billion, one hundred sixty-eight million, six hundred sixty-eight thousand, five hundred fifty-three".