5259666121 has 2 divisors, whose sum is σ = 5259666122. Its totient is φ = 5259666120.

The previous prime is 5259666107. The next prime is 5259666157. The reversal of 5259666121 is 1216669525.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3600000000 + 1659666121 = 60000^2 + 40739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5259666121 is a prime.

It is not a weakly prime, because it can be changed into another prime (5259666221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2629833060 + 2629833061.

It is an arithmetic number, because the mean of its divisors is an integer number (2629833061).

Almost surely, 2^5259666121 is an apocalyptic number.

It is an amenable number.

5259666121 is a deficient number, since it is larger than the sum of its proper divisors (1).

5259666121 is an equidigital number, since it uses as much as digits as its factorization.

5259666121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 194400, while the sum is 43.

The square root of 5259666121 is about 72523.5556284991. Note that the first 3 decimals coincide. The cubic root of 5259666121 is about 1739.0793254383.

The spelling of 5259666121 in words is "five billion, two hundred fifty-nine million, six hundred sixty-six thousand, one hundred twenty-one".