91618537922 has 6 divisors (see below), whose sum is σ = 137428448979. Its totient is φ = 45809054930.

The previous prime is 91618537891. The next prime is 91618537931. The reversal of 91618537922 is 22973581619.

It can be written as a sum of positive squares in only one way, i.e., 45809268961 + 45809268961 = 214031^2 + 214031^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=214031.

It is a Duffinian number.

It is an unprimeable number.

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 in 2 ways as a sum of consecutive naturals, for example, 321047 + ... + 535077.

Almost surely, 2^91618537922 is an apocalyptic number.

91618537922 is a deficient number, since it is larger than the sum of its proper divisors (45809911057).

91618537922 is an frugal number, since it uses more digits than its factorization.

91618537922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428064 (or 214033 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 53.

The spelling of 91618537922 in words is "ninety-one billion, six hundred eighteen million, five hundred thirty-seven thousand, nine hundred twenty-two".