91516659786 has 40 divisors (see below), whose sum is σ = 205193775204. Its totient is φ = 30486412800.

The previous prime is 91516659721. The next prime is 91516659791. The reversal of 91516659786 is 68795661519.

It can be written as a sum of positive squares in 2 ways, for example, as 68313754161 + 23202905625 = 261369^2 + 152325^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 82936 + ... + 435788.

Almost surely, 2^91516659786 is an apocalyptic number.

91516659786 is an abundant number, since it is smaller than the sum of its proper divisors (113677115418).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91516659786 is a wasteful number, since it uses less digits than its factorization.

91516659786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354468 (or 354459 counting only the distinct ones).

The product of its digits is 24494400, while the sum is 63.

The spelling of 91516659786 in words is "ninety-one billion, five hundred sixteen million, six hundred fifty-nine thousand, seven hundred eighty-six".