91011665505 has 32 divisors (see below), whose sum is σ = 155182915584. Its totient is φ = 45441277376.

The previous prime is 91011665473. The next prime is 91011665533. The reversal of 91011665505 is 50556611019.

It is not a de Polignac number, because 91011665505 - 2⁵ = 91011665473 is a prime.

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 31 ways as a sum of consecutive naturals, for example, 2790189 + ... + 2822618.

It is an arithmetic number, because the mean of its divisors is an integer number (4849466112).

Almost surely, 2^91011665505 is an apocalyptic number.

It is an amenable number.

91011665505 is a deficient number, since it is larger than the sum of its proper divisors (64171250079).

91011665505 is a wasteful number, since it uses less digits than its factorization.

91011665505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5612885.

The product of its (nonzero) digits is 40500, while the sum is 39.

The spelling of 91011665505 in words is "ninety-one billion, eleven million, six hundred sixty-five thousand, five hundred five".