194991035374799 has 4 divisors (see below), whose sum is σ = 194991066115536. Its totient is φ = 194991004634064.

The previous prime is 194991035374787. The next prime is 194991035374813. The reversal of 194991035374799 is 997473530199491.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-194991035374799 is a prime.

It is a super-2 number, since 2×194991035374799² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (194991035374999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1949579 + ... + 19843964.

It is an arithmetic number, because the mean of its divisors is an integer number (48747766528884).

Almost surely, 2^{194991035374799} is an apocalyptic number.

194991035374799 is a deficient number, since it is larger than the sum of its proper divisors (30740737).

194991035374799 is an equidigital number, since it uses as much as digits as its factorization.

194991035374799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30740736.

The product of its (nonzero) digits is 2083248720, while the sum is 80.

The spelling of 194991035374799 in words is "one hundred ninety-four trillion, nine hundred ninety-one billion, thirty-five million, three hundred seventy-four thousand, seven hundred ninety-nine".