91178917055 has 16 divisors (see below), whose sum is σ = 110960496000. Its totient is φ = 71918649600.

The previous prime is 91178917051. The next prime is 91178917103. The reversal of 91178917055 is 55071987119.

It is not a de Polignac number, because 91178917055 - 2² = 91178917051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91178916988 and 91178917006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91178917051) 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, 257030 + ... + 498419.

It is an arithmetic number, because the mean of its divisors is an integer number (6935031000).

Almost surely, 2^91178917055 is an apocalyptic number.

91178917055 is a deficient number, since it is larger than the sum of its proper divisors (19781578945).

91178917055 is a wasteful number, since it uses less digits than its factorization.

91178917055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755794.

The product of its (nonzero) digits is 793800, while the sum is 53.

The spelling of 91178917055 in words is "ninety-one billion, one hundred seventy-eight million, nine hundred seventeen thousand, fifty-five".