199101690492437 has 2 divisors, whose sum is σ = 199101690492438. Its totient is φ = 199101690492436.

The previous prime is 199101690492403. The next prime is 199101690492443. The reversal of 199101690492437 is 734294096101991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157036011022801 + 42065679469636 = 12531401^2 + 6485806^2 .

It is a cyclic number.

It is not a de Polignac number, because 199101690492437 - 2⁶ = 199101690492373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (199101690492137) 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, 99550845246218 + 99550845246219.

It is an arithmetic number, because the mean of its divisors is an integer number (99550845246219).

Almost surely, 2^{199101690492437} is an apocalyptic number.

It is an amenable number.

199101690492437 is a deficient number, since it is larger than the sum of its proper divisors (1).

199101690492437 is an equidigital number, since it uses as much as digits as its factorization.

199101690492437 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26453952, while the sum is 65.

The spelling of 199101690492437 in words is "one hundred ninety-nine trillion, one hundred one billion, six hundred ninety million, four hundred ninety-two thousand, four hundred thirty-seven".