91146685521 has 16 divisors (see below), whose sum is σ = 124913600000. Its totient is φ = 59074748928.

The previous prime is 91146685519. The next prime is 91146685537. The reversal of 91146685521 is 12558664119.

It is not a de Polignac number, because 91146685521 - 2¹ = 91146685519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91146685501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190081 + ... + 467358.

It is an arithmetic number, because the mean of its divisors is an integer number (7807100000).

Almost surely, 2^91146685521 is an apocalyptic number.

It is an amenable number.

91146685521 is a deficient number, since it is larger than the sum of its proper divisors (33766914479).

91146685521 is a wasteful number, since it uses less digits than its factorization.

91146685521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658728.

The product of its digits is 518400, while the sum is 48.

The spelling of 91146685521 in words is "ninety-one billion, one hundred forty-six million, six hundred eighty-five thousand, five hundred twenty-one".