66241560505 has 4 divisors (see below), whose sum is σ = 79489872612. Its totient is φ = 52993248400.

The previous prime is 66241560493. The next prime is 66241560521. The reversal of 66241560505 is 50506514266.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 34636187664 + 31605372841 = 186108^2 + 177779^2 .

It is not a de Polignac number, because 66241560505 - 2¹³ = 66241552313 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6624156046 + ... + 6624156055.

It is an arithmetic number, because the mean of its divisors is an integer number (19872468153).

Almost surely, 2^66241560505 is an apocalyptic number.

It is an amenable number.

66241560505 is a deficient number, since it is larger than the sum of its proper divisors (13248312107).

66241560505 is a wasteful number, since it uses less digits than its factorization.

66241560505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13248312106.

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 66241560505 in words is "sixty-six billion, two hundred forty-one million, five hundred sixty thousand, five hundred five".