191933965495439 has 4 divisors (see below), whose sum is σ = 198552378098760. Its totient is φ = 185315552892120.

The previous prime is 191933965495417. The next prime is 191933965495451. The reversal of 191933965495439 is 934594569339191.

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 191933965495439 - 2⁸ = 191933965495183 is a prime.

It is a super-2 number, since 2×191933965495439² (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 (191933965495469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3309206301617 + ... + 3309206301674.

It is an arithmetic number, because the mean of its divisors is an integer number (49638094524690).

Almost surely, 2^{191933965495439} is an apocalyptic number.

191933965495439 is a deficient number, since it is larger than the sum of its proper divisors (6618412603321).

191933965495439 is an equidigital number, since it uses as much as digits as its factorization.

191933965495439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6618412603320.

The product of its digits is 3826375200, while the sum is 80.

The spelling of 191933965495439 in words is "one hundred ninety-one trillion, nine hundred thirty-three billion, nine hundred sixty-five million, four hundred ninety-five thousand, four hundred thirty-nine".