91680206616 has 64 divisors (see below), whose sum is σ = 254784163200. Its totient is φ = 30546038304.

The previous prime is 91680206599. The next prime is 91680206621. The reversal of 91680206616 is 61660208619.

91680206616 is a `hidden beast` number, since 9 + 1 + 6 + 8 + 0 + 20 + 6 + 616 = 666.

It is a super-3 number, since 3×91680206616³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 379515 + ... + 572181.

It is an arithmetic number, because the mean of its divisors is an integer number (3981002550).

Almost surely, 2^91680206616 is an apocalyptic number.

It is an amenable number.

91680206616 is an abundant number, since it is smaller than the sum of its proper divisors (163103956584).

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

91680206616 is a wasteful number, since it uses less digits than its factorization.

91680206616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194885 (or 194875 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The spelling of 91680206616 in words is "ninety-one billion, six hundred eighty million, two hundred six thousand, six hundred sixteen".