194937962689 has 2 divisors, whose sum is σ = 194937962690. Its totient is φ = 194937962688.

The previous prime is 194937962663. The next prime is 194937962707. The reversal of 194937962689 is 986269739491.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 185916192400 + 9021770289 = 431180^2 + 94983^2 .

It is a cyclic number.

It is not a de Polignac number, because 194937962689 - 2⁵ = 194937962657 is a prime.

It is a super-2 number, since 2×194937962689² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (194937962189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97468981344 + 97468981345.

It is an arithmetic number, because the mean of its divisors is an integer number (97468981345).

Almost surely, 2^194937962689 is an apocalyptic number.

It is an amenable number.

194937962689 is a deficient number, since it is larger than the sum of its proper divisors (1).

194937962689 is an equidigital number, since it uses as much as digits as its factorization.

194937962689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 317447424, while the sum is 73.

The spelling of 194937962689 in words is "one hundred ninety-four billion, nine hundred thirty-seven million, nine hundred sixty-two thousand, six hundred eighty-nine".