91785235623 has 4 divisors (see below), whose sum is σ = 122380314168. Its totient is φ = 61190157080.

The previous prime is 91785235601. The next prime is 91785235651. The reversal of 91785235623 is 32653258719.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91785235623 - 2⁶ = 91785235559 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91785237623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15297539268 + ... + 15297539273.

It is an arithmetic number, because the mean of its divisors is an integer number (30595078542).

Almost surely, 2^91785235623 is an apocalyptic number.

91785235623 is a deficient number, since it is larger than the sum of its proper divisors (30595078545).

91785235623 is a wasteful number, since it uses less digits than its factorization.

91785235623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30595078544.

The product of its digits is 2721600, while the sum is 51.

The spelling of 91785235623 in words is "ninety-one billion, seven hundred eighty-five million, two hundred thirty-five thousand, six hundred twenty-three".