91055231985178 has 8 divisors (see below), whose sum is σ = 136708038492480. Its totient is φ = 45485885821020.

The previous prime is 91055231985119. The next prime is 91055231985199. The reversal of 91055231985178 is 87158913255019.

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

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, 20865083058 + ... + 20865087421.

It is an arithmetic number, because the mean of its divisors is an integer number (17088504811560).

Almost surely, 2^{91055231985178} is an apocalyptic number.

91055231985178 is a deficient number, since it is larger than the sum of its proper divisors (45652806507302).

91055231985178 is a wasteful number, since it uses less digits than its factorization.

91055231985178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41730171572.

The product of its (nonzero) digits is 27216000, while the sum is 64.

The spelling of 91055231985178 in words is "ninety-one trillion, fifty-five billion, two hundred thirty-one million, nine hundred eighty-five thousand, one hundred seventy-eight".