66359859121 has 2 divisors, whose sum is σ = 66359859122. Its totient is φ = 66359859120.

The previous prime is 66359859119. The next prime is 66359859179. The reversal of 66359859121 is 12195895366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56009848896 + 10350010225 = 236664^2 + 101735^2 .

It is a cyclic number.

It is not a de Polignac number, because 66359859121 - 2¹ = 66359859119 is a prime.

Together with 66359859119, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66359859101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33179929560 + 33179929561.

It is an arithmetic number, because the mean of its divisors is an integer number (33179929561).

Almost surely, 2^66359859121 is an apocalyptic number.

It is an amenable number.

66359859121 is a deficient number, since it is larger than the sum of its proper divisors (1).

66359859121 is an equidigital number, since it uses as much as digits as its factorization.

66359859121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3499200, while the sum is 55.

It can be divided in two parts, 66359 and 859121, that added together give a triangular number (925480 = T₁₃₆₀).

The spelling of 66359859121 in words is "sixty-six billion, three hundred fifty-nine million, eight hundred fifty-nine thousand, one hundred twenty-one".