91818640910 has 16 divisors (see below), whose sum is σ = 165295109376. Its totient is φ = 36722666208.

The previous prime is 91818640877. The next prime is 91818640937. The reversal of 91818640910 is 1904681819.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 517742 + ... + 672081.

It is an arithmetic number, because the mean of its divisors is an integer number (10330944336).

Almost surely, 2^91818640910 is an apocalyptic number.

91818640910 is a deficient number, since it is larger than the sum of its proper divisors (73476468466).

91818640910 is a wasteful number, since it uses less digits than its factorization.

91818640910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197547.

The product of its (nonzero) digits is 124416, while the sum is 47.

The spelling of 91818640910 in words is "ninety-one billion, eight hundred eighteen million, six hundred forty thousand, nine hundred ten".