66566612353 has 4 divisors (see below), whose sum is σ = 67694860080.
Its totient is φ = 65438364628.
The previous prime is 66566612317. The next prime is 66566612363. The reversal of 66566612353 is 35321666566.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35321666566 = 2 ⋅17660833283.
It is a cyclic number.
It is not a de Polignac number, because 66566612353 - 229 = 66029741441 is a prime.
It is a super-2 number, since 2×665666123532 (a number of 22 digits) contains 22 as substring.
It is a Duffinian number.
It is a junction number, because it is equal to n+sod(n) for n = 66566612297 and 66566612306.
It is not an unprimeable number, because it can be changed into a prime (66566612363) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (23) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 564123775 + ... + 564123892.
It is an arithmetic number, because the mean of its divisors is an integer number (16923715020).
Almost surely, 266566612353 is an apocalyptic number.
It is an amenable number.
66566612353 is a deficient number, since it is larger than the sum of its proper divisors (1128247727).
66566612353 is a wasteful number, since it uses less digits than its factorization.
66566612353 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 1128247726.
The product of its digits is 3499200, while the sum is 49.
The spelling of 66566612353 in words is "sixty-six billion, five hundred sixty-six million, six hundred twelve thousand, three hundred fifty-three".