91477173496878 has 192 divisors, whose sum is σ = 216139899044160. Its totient is φ = 27793269504000.

The previous prime is 91477173496859. The next prime is 91477173496879. The reversal of 91477173496878 is 87869437177419.

It is a happy number.

91477173496878 is a `hidden beast` number, since 9 + 1 + 47 + 7 + 1 + 7 + 3 + 496 + 87 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 91477173496797 and 91477173496806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91477173496879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 24663566088 + ... + 24663569796.

It is an arithmetic number, because the mean of its divisors is an integer number (1125728640855).

Almost surely, 2^{91477173496878} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91477173496878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108069949522080).

91477173496878 is an abundant number, since it is smaller than the sum of its proper divisors (124662725547282).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91477173496878 is a wasteful number, since it uses less digits than its factorization.

91477173496878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6355 (or 6352 counting only the distinct ones).

The product of its digits is 3584673792, while the sum is 81.

The spelling of 91477173496878 in words is "ninety-one trillion, four hundred seventy-seven billion, one hundred seventy-three million, four hundred ninety-six thousand, eight hundred seventy-eight".