91473615585855 has 256 divisors, whose sum is σ = 176104137830400. Its totient is φ = 44883161579520.

The previous prime is 91473615585841. The next prime is 91473615585887. The reversal of 91473615585855 is 55858551637419.

It is a happy number.

91473615585855 is a `hidden beast` number, since 9 + 1 + 4 + 7 + 3 + 61 + 558 + 5 + 8 + 5 + 5 = 666.

It is a Cunningham number, because it is equal to 9564184²-1.

It is not a de Polignac number, because 91473615585855 - 2⁶ = 91473615585791 is a prime.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 10950985359 + ... + 10950993711.

It is an arithmetic number, because the mean of its divisors is an integer number (687906788400).

Almost surely, 2^{91473615585855} is an apocalyptic number.

91473615585855 is a deficient number, since it is larger than the sum of its proper divisors (84630522244545).

91473615585855 is a wasteful number, since it uses less digits than its factorization.

91473615585855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8991 (or 8985 counting only the distinct ones).

The product of its digits is 907200000, while the sum is 72.

The spelling of 91473615585855 in words is "ninety-one trillion, four hundred seventy-three billion, six hundred fifteen million, five hundred eighty-five thousand, eight hundred fifty-five".