97591635765855 has 320 divisors, whose sum is σ = 231003215815680. Its totient is φ = 38161298534400.

The previous prime is 97591635765851. The next prime is 97591635765859. The reversal of 97591635765855 is 55856753619579.

97591635765855 is a `hidden beast` number, since 9 + 75 + 91 + 6 + 357 + 65 + 8 + 55 = 666.

It is an interprime number because it is at equal distance from previous prime (97591635765851) and next prime (97591635765859).

It is not a de Polignac number, because 97591635765855 - 2² = 97591635765851 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97591635765851) by changing a digit.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 2083976581 + ... + 2084023409.

It is an arithmetic number, because the mean of its divisors is an integer number (721885049424).

Almost surely, 2^{97591635765855} is an apocalyptic number.

97591635765855 is an abundant number, since it is smaller than the sum of its proper divisors (133411580049825).

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

97591635765855 is a wasteful number, since it uses less digits than its factorization.

97591635765855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50812 (or 50803 counting only the distinct ones).

The product of its digits is 10716300000, while the sum is 81.

The spelling of 97591635765855 in words is "ninety-seven trillion, five hundred ninety-one billion, six hundred thirty-five million, seven hundred sixty-five thousand, eight hundred fifty-five".