91229415555 has 16 divisors (see below), whose sum is σ = 147725706240. Its totient is φ = 48069474528.

The previous prime is 91229415551. The next prime is 91229415569. The reversal of 91229415555 is 55551492219.

It is not a de Polignac number, because 91229415555 - 2² = 91229415551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91229415551) 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, 36637075 + ... + 36639564.

It is an arithmetic number, because the mean of its divisors is an integer number (9232856640).

Almost surely, 2^91229415555 is an apocalyptic number.

91229415555 is a deficient number, since it is larger than the sum of its proper divisors (56496290685).

91229415555 is a wasteful number, since it uses less digits than its factorization.

91229415555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73276730.

The product of its digits is 810000, while the sum is 48.

The spelling of 91229415555 in words is "ninety-one billion, two hundred twenty-nine million, four hundred fifteen thousand, five hundred fifty-five".