91197686798 has 8 divisors (see below), whose sum is σ = 136928195040. Its totient is φ = 45554955120.

The previous prime is 91197686771. The next prime is 91197686863. The reversal of 91197686798 is 89768679119.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×91197686798² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21941543 + ... + 21945698.

It is an arithmetic number, because the mean of its divisors is an integer number (17116024380).

Almost surely, 2^91197686798 is an apocalyptic number.

91197686798 is a deficient number, since it is larger than the sum of its proper divisors (45730508242).

91197686798 is a wasteful number, since it uses less digits than its factorization.

91197686798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43888282.

The product of its digits is 82301184, while the sum is 71.

The spelling of 91197686798 in words is "ninety-one billion, one hundred ninety-seven million, six hundred eighty-six thousand, seven hundred ninety-eight".