91681386995 has 16 divisors (see below), whose sum is σ = 120964313088. Its totient is φ = 66152348640.

The previous prime is 91681386991. The next prime is 91681387009. The reversal of 91681386995 is 59968318619.

It is not a de Polignac number, because 91681386995 - 2² = 91681386991 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91681386991) 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, 6555749 + ... + 6569718.

It is an arithmetic number, because the mean of its divisors is an integer number (7560269568).

Almost surely, 2^91681386995 is an apocalyptic number.

91681386995 is a deficient number, since it is larger than the sum of its proper divisors (29282926093).

91681386995 is a wasteful number, since it uses less digits than its factorization.

91681386995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13125610.

The product of its digits is 25194240, while the sum is 65.

The spelling of 91681386995 in words is "ninety-one billion, six hundred eighty-one million, three hundred eighty-six thousand, nine hundred ninety-five".