66800264565 has 16 divisors (see below), whose sum is σ = 106884243648. Its totient is φ = 35625534336.

The previous prime is 66800264563. The next prime is 66800264569. The reversal of 66800264565 is 56546200866.

It is not a de Polignac number, because 66800264565 - 2¹ = 66800264563 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66800264563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 481774 + ... + 604736.

It is an arithmetic number, because the mean of its divisors is an integer number (6680265228).

Almost surely, 2^66800264565 is an apocalyptic number.

It is an amenable number.

66800264565 is a deficient number, since it is larger than the sum of its proper divisors (40083979083).

66800264565 is a wasteful number, since it uses less digits than its factorization.

66800264565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159188.

The product of its (nonzero) digits is 2073600, while the sum is 48.

The spelling of 66800264565 in words is "sixty-six billion, eight hundred million, two hundred sixty-four thousand, five hundred sixty-five".