91680206615 has 16 divisors (see below), whose sum is σ = 113824630080. Its totient is φ = 70805898240.

The previous prime is 91680206599. The next prime is 91680206621. The reversal of 91680206615 is 51660208619.

It is not a de Polignac number, because 91680206615 - 2⁴ = 91680206599 is a prime.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 1217255 + ... + 1290375.

It is an arithmetic number, because the mean of its divisors is an integer number (7114039380).

Almost surely, 2^91680206615 is an apocalyptic number.

91680206615 is a deficient number, since it is larger than the sum of its proper divisors (22144423465).

91680206615 is a wasteful number, since it uses less digits than its factorization.

91680206615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81802.

The product of its (nonzero) digits is 155520, while the sum is 44.

The spelling of 91680206615 in words is "ninety-one billion, six hundred eighty million, two hundred six thousand, six hundred fifteen".