42091853805 has 12 divisors (see below), whose sum is σ = 72959213340. Its totient is φ = 22448988672.

The previous prime is 42091853773. The next prime is 42091853807. The reversal of 42091853805 is 50835819024.

42091853805 is a `hidden beast` number, since 4 + 20 + 91 + 8 + 538 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11019330729 + 31072523076 = 104973^2 + 176274^2 .

It is not a de Polignac number, because 42091853805 - 2⁵ = 42091853773 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 935374529 = 42091853805 / (4 + 2 + 0 + 9 + 1 + 8 + 5 + 3 + 8 + 0 + 5).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42091853807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 467687220 + ... + 467687309.

It is an arithmetic number, because the mean of its divisors is an integer number (6079934445).

Almost surely, 2^42091853805 is an apocalyptic number.

42091853805 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42091853805 is a deficient number, since it is larger than the sum of its proper divisors (30867359535).

42091853805 is a wasteful number, since it uses less digits than its factorization.

42091853805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 935374540 (or 935374537 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 45.

The spelling of 42091853805 in words is "forty-two billion, ninety-one million, eight hundred fifty-three thousand, eight hundred five".