199517940427079 has 4 divisors (see below), whose sum is σ = 211254289863984. Its totient is φ = 187781590990176.

The previous prime is 199517940426967. The next prime is 199517940427111. The reversal of 199517940427079 is 970724049715991.

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

It is a cyclic number.

It is not a de Polignac number, because 199517940427079 - 2⁸ = 199517940426823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 199517940426997 and 199517940427015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (199517940424079) 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, 5868174718427 + ... + 5868174718460.

It is an arithmetic number, because the mean of its divisors is an integer number (52813572465996).

Almost surely, 2^{199517940427079} is an apocalyptic number.

199517940427079 is a deficient number, since it is larger than the sum of its proper divisors (11736349436905).

199517940427079 is a wasteful number, since it uses less digits than its factorization.

199517940427079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11736349436904.

The product of its (nonzero) digits is 360067680, while the sum is 74.

The spelling of 199517940427079 in words is "one hundred ninety-nine trillion, five hundred seventeen billion, nine hundred forty million, four hundred twenty-seven thousand, seventy-nine".