221766667091 has 2 divisors, whose sum is σ = 221766667092. Its totient is φ = 221766667090.

The previous prime is 221766667063. The next prime is 221766667153. The reversal of 221766667091 is 190766667122.

221766667091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221766667091 - 2⁶ = 221766667027 is a prime.

It is not a weakly prime, because it can be changed into another prime (221766667691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110883333545 + 110883333546.

It is an arithmetic number, because the mean of its divisors is an integer number (110883333546).

Almost surely, 2^221766667091 is an apocalyptic number.

221766667091 is a deficient number, since it is larger than the sum of its proper divisors (1).

221766667091 is an equidigital number, since it uses as much as digits as its factorization.

221766667091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 221766667091 in words is "two hundred twenty-one billion, seven hundred sixty-six million, six hundred sixty-seven thousand, ninety-one".