66500611147381 has 2 divisors, whose sum is σ = 66500611147382. Its totient is φ = 66500611147380.

The previous prime is 66500611147361. The next prime is 66500611147447. The reversal of 66500611147381 is 18374111600566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42033827222500 + 24466783924881 = 6483350^2 + 4946391^2 .

It is a cyclic number.

It is not a de Polignac number, because 66500611147381 - 2⁷ = 66500611147253 is a prime.

It is a super-2 number, since 2×66500611147381² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66500611147361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33250305573690 + 33250305573691.

It is an arithmetic number, because the mean of its divisors is an integer number (33250305573691).

Almost surely, 2^{66500611147381} is an apocalyptic number.

It is an amenable number.

66500611147381 is a deficient number, since it is larger than the sum of its proper divisors (1).

66500611147381 is an equidigital number, since it uses as much as digits as its factorization.

66500611147381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 49.

The spelling of 66500611147381 in words is "sixty-six trillion, five hundred billion, six hundred eleven million, one hundred forty-seven thousand, three hundred eighty-one".