191945299151 has 4 divisors (see below), whose sum is σ = 198564102600. Its totient is φ = 185326495704.

The previous prime is 191945299141. The next prime is 191945299157. The reversal of 191945299151 is 151992549191.

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 191945299151 - 2¹⁸ = 191945037007 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191945299157) 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, 3309401681 + ... + 3309401738.

It is an arithmetic number, because the mean of its divisors is an integer number (49641025650).

Almost surely, 2^191945299151 is an apocalyptic number.

191945299151 is a deficient number, since it is larger than the sum of its proper divisors (6618803449).

191945299151 is an equidigital number, since it uses as much as digits as its factorization.

191945299151 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6618803448.

The product of its digits is 1312200, while the sum is 56.

The spelling of 191945299151 in words is "one hundred ninety-one billion, nine hundred forty-five million, two hundred ninety-nine thousand, one hundred fifty-one".