191918650451 has 16 divisors (see below), whose sum is σ = 211994254080. Its totient is φ = 172283226720.

The previous prime is 191918650433. The next prime is 191918650513. The reversal of 191918650451 is 154056819191.

It is not a de Polignac number, because 191918650451 - 2¹⁴ = 191918634067 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 191918650451.

It is not an unprimeable number, because it can be changed into a prime (191918650411) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1810061 + ... + 1913153.

It is an arithmetic number, because the mean of its divisors is an integer number (13249640880).

Almost surely, 2^191918650451 is an apocalyptic number.

191918650451 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

191918650451 is a deficient number, since it is larger than the sum of its proper divisors (20075603629).

191918650451 is a wasteful number, since it uses less digits than its factorization.

191918650451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105226.

The product of its (nonzero) digits is 388800, while the sum is 50.

The spelling of 191918650451 in words is "one hundred ninety-one billion, nine hundred eighteen million, six hundred fifty thousand, four hundred fifty-one".