83405566091 has 2 divisors, whose sum is σ = 83405566092. Its totient is φ = 83405566090.

The previous prime is 83405566081. The next prime is 83405566121. The reversal of 83405566091 is 19066550438.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 83405566091 - 2²² = 83401371787 is a prime.

It is not a weakly prime, because it can be changed into another prime (83405566081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41702783045 + 41702783046.

It is an arithmetic number, because the mean of its divisors is an integer number (41702783046).

Almost surely, 2^83405566091 is an apocalyptic number.

83405566091 is a deficient number, since it is larger than the sum of its proper divisors (1).

83405566091 is an equidigital number, since it uses as much as digits as its factorization.

83405566091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 777600, while the sum is 47.

The spelling of 83405566091 in words is "eighty-three billion, four hundred five million, five hundred sixty-six thousand, ninety-one".