191933965495451 has 2 divisors, whose sum is σ = 191933965495452. Its totient is φ = 191933965495450.

The previous prime is 191933965495417. The next prime is 191933965495453. The reversal of 191933965495451 is 154594569339191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191933965495451 - 2⁴² = 187535918984347 is a prime.

It is a super-2 number, since 2×191933965495451² (a number of 29 digits) contains 22 as substring.

Together with 191933965495453, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (191933965495453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95966982747725 + 95966982747726.

It is an arithmetic number, because the mean of its divisors is an integer number (95966982747726).

Almost surely, 2^{191933965495451} is an apocalyptic number.

191933965495451 is a deficient number, since it is larger than the sum of its proper divisors (1).

191933965495451 is an equidigital number, since it uses as much as digits as its factorization.

191933965495451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 708588000, while the sum is 74.

The spelling of 191933965495451 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 fifty-one".