194336921563 has 2 divisors, whose sum is σ = 194336921564. Its totient is φ = 194336921562.

The previous prime is 194336921531. The next prime is 194336921609. The reversal of 194336921563 is 365129633491.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 194336921563 - 2⁵ = 194336921531 is a prime.

It is a super-2 number, since 2×194336921563² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 194336921563.

It is not a weakly prime, because it can be changed into another prime (194336924563) 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, 97168460781 + 97168460782.

It is an arithmetic number, because the mean of its divisors is an integer number (97168460782).

Almost surely, 2^194336921563 is an apocalyptic number.

194336921563 is a deficient number, since it is larger than the sum of its proper divisors (1).

194336921563 is an equidigital number, since it uses as much as digits as its factorization.

194336921563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3149280, while the sum is 52.

The spelling of 194336921563 in words is "one hundred ninety-four billion, three hundred thirty-six million, nine hundred twenty-one thousand, five hundred sixty-three".