91222227777779 has 48 divisors (see below), whose sum is σ = 112639127731200. Its totient is φ = 72326056163328.

The previous prime is 91222227777739. The next prime is 91222227777851. The reversal of 91222227777779 is 97777772222219.

It is not a de Polignac number, because 91222227777779 - 2⁴⁰ = 90122716150003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91222227777739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 48847667 + ... + 50680755.

It is an arithmetic number, because the mean of its divisors is an integer number (2346648494400).

Almost surely, 2^{91222227777779} is an apocalyptic number.

91222227777779 is a deficient number, since it is larger than the sum of its proper divisors (21416899953421).

91222227777779 is a wasteful number, since it uses less digits than its factorization.

91222227777779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1833600 (or 1833581 counting only the distinct ones).

The product of its digits is 304946208, while the sum is 71.

The spelling of 91222227777779 in words is "ninety-one trillion, two hundred twenty-two billion, two hundred twenty-seven million, seven hundred seventy-seven thousand, seven hundred seventy-nine".