91023311332018 has 32 divisors (see below), whose sum is σ = 154783644402240. Its totient is φ = 39797824426560.

The previous prime is 91023311331937. The next prime is 91023311332021. The reversal of 91023311332018 is 81023311332019.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6447321 + ... + 14953747.

It is an arithmetic number, because the mean of its divisors is an integer number (4836988887570).

Almost surely, 2^{91023311332018} is an apocalyptic number.

91023311332018 is a deficient number, since it is larger than the sum of its proper divisors (63760333070222).

91023311332018 is a wasteful number, since it uses less digits than its factorization.

91023311332018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8528122.

The product of its (nonzero) digits is 23328, while the sum is 37.

Subtracting from 91023311332018 its reverse (81023311332019), we obtain a palindrome (9999999999999).

The spelling of 91023311332018 in words is "ninety-one trillion, twenty-three billion, three hundred eleven million, three hundred thirty-two thousand, eighteen".