66347250565505 has 24 divisors (see below), whose sum is σ = 99739603052712. Its totient is φ = 41995622333952.

The previous prime is 66347250565489. The next prime is 66347250565517. The reversal of 66347250565505 is 50556505274366.

It can be written as a sum of positive squares in 4 ways, for example, as 1922082777664 + 64425167787841 = 1386392^2 + 8026529^2 .

It is not a de Polignac number, because 66347250565505 - 2⁴ = 66347250565489 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10415577752 + ... + 10415584121.

It is an arithmetic number, because the mean of its divisors is an integer number (4155816793863).

Almost surely, 2^{66347250565505} is an apocalyptic number.

66347250565505 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66347250565505 is a deficient number, since it is larger than the sum of its proper divisors (33392352487207).

66347250565505 is a wasteful number, since it uses less digits than its factorization.

66347250565505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20831161905 (or 20831161898 counting only the distinct ones).

The product of its (nonzero) digits is 113400000, while the sum is 59.

The spelling of 66347250565505 in words is "sixty-six trillion, three hundred forty-seven billion, two hundred fifty million, five hundred sixty-five thousand, five hundred five".