66717644010253 has 2 divisors, whose sum is σ = 66717644010254. Its totient is φ = 66717644010252.

The previous prime is 66717644010239. The next prime is 66717644010289. The reversal of 66717644010253 is 35201044671766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59482394025289 + 7235249984964 = 7712483^2 + 2689842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66717644010253 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66717644010253.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66717644010203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33358822005126 + 33358822005127.

It is an arithmetic number, because the mean of its divisors is an integer number (33358822005127).

Almost surely, 2^{66717644010253} is an apocalyptic number.

It is an amenable number.

66717644010253 is a deficient number, since it is larger than the sum of its proper divisors (1).

66717644010253 is an equidigital number, since it uses as much as digits as its factorization.

66717644010253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5080320, while the sum is 52.

The spelling of 66717644010253 in words is "sixty-six trillion, seven hundred seventeen billion, six hundred forty-four million, ten thousand, two hundred fifty-three".