66241710665 has 12 divisors (see below), whose sum is σ = 86075028684. Its totient is φ = 48916954944.

The previous prime is 66241710629. The next prime is 66241710697. The reversal of 66241710665 is 56601714266.

It can be written as a sum of positive squares in 6 ways, for example, as 1634746624 + 64606964041 = 40432^2 + 254179^2 .

It is not a de Polignac number, because 66241710665 - 2¹⁸ = 66241448521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39195434 + ... + 39197123.

It is an arithmetic number, because the mean of its divisors is an integer number (7172919057).

Almost surely, 2^66241710665 is an apocalyptic number.

66241710665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66241710665 is a deficient number, since it is larger than the sum of its proper divisors (19833318019).

66241710665 is a wasteful number, since it uses less digits than its factorization.

66241710665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78392588 (or 78392575 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 66241710665 in words is "sixty-six billion, two hundred forty-one million, seven hundred ten thousand, six hundred sixty-five".