66468208565 has 32 divisors (see below), whose sum is σ = 88398680832. Its totient is φ = 47573568000.

The previous prime is 66468208549. The next prime is 66468208571. The reversal of 66468208565 is 56580286466.

It is not a de Polignac number, because 66468208565 - 2⁴ = 66468208549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66468208565.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1832960 + ... + 1868870.

It is an arithmetic number, because the mean of its divisors is an integer number (2762458776).

Almost surely, 2^66468208565 is an apocalyptic number.

It is an amenable number.

66468208565 is a deficient number, since it is larger than the sum of its proper divisors (21930472267).

66468208565 is a wasteful number, since it uses less digits than its factorization.

66468208565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36461.

The product of its (nonzero) digits is 16588800, while the sum is 56.

The spelling of 66468208565 in words is "sixty-six billion, four hundred sixty-eight million, two hundred eight thousand, five hundred sixty-five".