91908817694 has 32 divisors (see below), whose sum is σ = 139883474016. Its totient is φ = 45285811200.

The previous prime is 91908817681. The next prime is 91908817787. The reversal of 91908817694 is 49671880919.

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, 70319789 + ... + 70321095.

It is an arithmetic number, because the mean of its divisors is an integer number (4371358563).

Almost surely, 2^91908817694 is an apocalyptic number.

91908817694 is a deficient number, since it is larger than the sum of its proper divisors (47974656322).

91908817694 is a wasteful number, since it uses less digits than its factorization.

91908817694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2780.

The product of its (nonzero) digits is 7838208, while the sum is 62.

The spelling of 91908817694 in words is "ninety-one billion, nine hundred eight million, eight hundred seventeen thousand, six hundred ninety-four".