66368141765 has 16 divisors (see below), whose sum is σ = 81622897776. Its totient is φ = 51774988800.

The previous prime is 66368141761. The next prime is 66368141783. The reversal of 66368141765 is 56714186366.

It can be written as a sum of positive squares in 8 ways, for example, as 3340030849 + 63028110916 = 57793^2 + 251054^2 .

It is not a de Polignac number, because 66368141765 - 2² = 66368141761 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66368141761) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 363299 + ... + 514511.

It is an arithmetic number, because the mean of its divisors is an integer number (5101431111).

Almost surely, 2^66368141765 is an apocalyptic number.

It is an amenable number.

66368141765 is a deficient number, since it is larger than the sum of its proper divisors (15254756011).

66368141765 is a wasteful number, since it uses less digits than its factorization.

66368141765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153400.

The product of its digits is 4354560, while the sum is 53.

The spelling of 66368141765 in words is "sixty-six billion, three hundred sixty-eight million, one hundred forty-one thousand, seven hundred sixty-five".