66076630726261 has 2 divisors, whose sum is σ = 66076630726262. Its totient is φ = 66076630726260.

The previous prime is 66076630726259. The next prime is 66076630726343. The reversal of 66076630726261 is 16262703667066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58411933272900 + 7664697453361 = 7642770^2 + 2768519^2 .

It is a cyclic number.

It is not a de Polignac number, because 66076630726261 - 2¹ = 66076630726259 is a prime.

It is a super-2 number, since 2×66076630726261² (a number of 28 digits) contains 22 as substring.

Together with 66076630726259, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 66076630726196 and 66076630726205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66076630726361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33038315363130 + 33038315363131.

It is an arithmetic number, because the mean of its divisors is an integer number (33038315363131).

Almost surely, 2^{66076630726261} is an apocalyptic number.

It is an amenable number.

66076630726261 is a deficient number, since it is larger than the sum of its proper divisors (1).

66076630726261 is an equidigital number, since it uses as much as digits as its factorization.

66076630726261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27433728, while the sum is 58.

The spelling of 66076630726261 in words is "sixty-six trillion, seventy-six billion, six hundred thirty million, seven hundred twenty-six thousand, two hundred sixty-one".