91656215012 has 24 divisors (see below), whose sum is σ = 164191717536. Its totient is φ = 44745115968.

The previous prime is 91656214931. The next prime is 91656215017. The reversal of 91656215012 is 21051265619.

It is not an unprimeable number, because it can be changed into a prime (91656215017) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 351683 + ... + 554069.

It is an arithmetic number, because the mean of its divisors is an integer number (6841321564).

Almost surely, 2^91656215012 is an apocalyptic number.

It is an amenable number.

91656215012 is a deficient number, since it is larger than the sum of its proper divisors (72535502524).

91656215012 is a wasteful number, since it uses less digits than its factorization.

91656215012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205067 (or 205065 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 38.

The spelling of 91656215012 in words is "ninety-one billion, six hundred fifty-six million, two hundred fifteen thousand, twelve".