66648466484665 has 16 divisors (see below), whose sum is σ = 87098082397200. Its totient is φ = 48664325394432.

The previous prime is 66648466484651. The next prime is 66648466484681. The reversal of 66648466484665 is 56648466484666.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 18375694009344 + 48272772475321 = 4286688^2 + 6947861^2 .

It is a cyclic number.

It is not a de Polignac number, because 66648466484665 - 2¹¹ = 66648466482617 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5760449400 + ... + 5760460969.

It is an arithmetic number, because the mean of its divisors is an integer number (5443630149825).

Almost surely, 2^{66648466484665} is an apocalyptic number.

66648466484665 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

66648466484665 is a deficient number, since it is larger than the sum of its proper divisors (20449615912535).

66648466484665 is a wasteful number, since it uses less digits than its factorization.

66648466484665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11520910476.

The product of its digits is 22932357120, while the sum is 79.

Subtracting from 66648466484665 its reverse (56648466484666), we obtain a palindrome (9999999999999).

The spelling of 66648466484665 in words is "sixty-six trillion, six hundred forty-eight billion, four hundred sixty-six million, four hundred eighty-four thousand, six hundred sixty-five".