201818646091 has 2 divisors, whose sum is σ = 201818646092. Its totient is φ = 201818646090.

The previous prime is 201818646077. The next prime is 201818646137. The reversal of 201818646091 is 190646818102.

It is an a-pointer prime, because the next prime (201818646137) can be obtained adding 201818646091 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 201818646091 - 2⁵ = 201818646059 is a prime.

It is not a weakly prime, because it can be changed into another prime (201818646061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100909323045 + 100909323046.

It is an arithmetic number, because the mean of its divisors is an integer number (100909323046).

Almost surely, 2^201818646091 is an apocalyptic number.

201818646091 is a deficient number, since it is larger than the sum of its proper divisors (1).

201818646091 is an equidigital number, since it uses as much as digits as its factorization.

201818646091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 165888, while the sum is 46.

The spelling of 201818646091 in words is "two hundred one billion, eight hundred eighteen million, six hundred forty-six thousand, ninety-one".