66256619293441 has 8 divisors (see below), whose sum is σ = 66592598178600. Its totient is φ = 65921489913600.

The previous prime is 66256619293439. The next prime is 66256619293453. The reversal of 66256619293441 is 14439291665266.

It can be written as a sum of positive squares in 4 ways, for example, as 39302818486416 + 26953800807025 = 6269196^2 + 5191705^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66256619293441 - 2¹ = 66256619293439 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66256619293141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212219946 + ... + 212531923.

It is an arithmetic number, because the mean of its divisors is an integer number (8324074772325).

Almost surely, 2^{66256619293441} is an apocalyptic number.

It is an amenable number.

66256619293441 is a deficient number, since it is larger than the sum of its proper divisors (335978885159).

66256619293441 is a wasteful number, since it uses less digits than its factorization.

66256619293441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424752659.

The product of its digits is 100776960, while the sum is 64.

The spelling of 66256619293441 in words is "sixty-six trillion, two hundred fifty-six billion, six hundred nineteen million, two hundred ninety-three thousand, four hundred forty-one".