83405566121 has 2 divisors, whose sum is σ = 83405566122. Its totient is φ = 83405566120.

The previous prime is 83405566091. The next prime is 83405566133. The reversal of 83405566121 is 12166550438.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 79569126400 + 3836439721 = 282080^2 + 61939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83405566121 is a prime.

It is not a weakly prime, because it can be changed into another prime (83405566151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41702783060 + 41702783061.

It is an arithmetic number, because the mean of its divisors is an integer number (41702783061).

Almost surely, 2^83405566121 is an apocalyptic number.

It is an amenable number.

83405566121 is a deficient number, since it is larger than the sum of its proper divisors (1).

83405566121 is an equidigital number, since it uses as much as digits as its factorization.

83405566121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 83405566121 in words is "eighty-three billion, four hundred five million, five hundred sixty-six thousand, one hundred twenty-one".