191018566433 has 2 divisors, whose sum is σ = 191018566434. Its totient is φ = 191018566432.

The previous prime is 191018566379. The next prime is 191018566457. The reversal of 191018566433 is 334665810191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135300380224 + 55718186209 = 367832^2 + 236047^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191018566433 is a prime.

It is not a weakly prime, because it can be changed into another prime (191018566133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95509283216 + 95509283217.

It is an arithmetic number, because the mean of its divisors is an integer number (95509283217).

Almost surely, 2^191018566433 is an apocalyptic number.

It is an amenable number.

191018566433 is a deficient number, since it is larger than the sum of its proper divisors (1).

191018566433 is an equidigital number, since it uses as much as digits as its factorization.

191018566433 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 47.

The spelling of 191018566433 in words is "one hundred ninety-one billion, eighteen million, five hundred sixty-six thousand, four hundred thirty-three".