91958241785851 has 4 divisors (see below), whose sum is σ = 105095133469552. Its totient is φ = 78821350102152.

The previous prime is 91958241785801. The next prime is 91958241785887. The reversal of 91958241785851 is 15858714285919.

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

It is not a de Polignac number, because 91958241785851 - 2¹¹ = 91958241783803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91958241785801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6568445841840 + ... + 6568445841853.

It is an arithmetic number, because the mean of its divisors is an integer number (26273783367388).

Almost surely, 2^{91958241785851} is an apocalyptic number.

91958241785851 is a deficient number, since it is larger than the sum of its proper divisors (13136891683701).

91958241785851 is a wasteful number, since it uses less digits than its factorization.

91958241785851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13136891683700.

The product of its digits is 290304000, while the sum is 73.

The spelling of 91958241785851 in words is "ninety-one trillion, nine hundred fifty-eight billion, two hundred forty-one million, seven hundred eighty-five thousand, eight hundred fifty-one".