66505162321311 has 24 divisors (see below), whose sum is σ = 103561823683584. Its totient is φ = 37851543702000.

The previous prime is 66505162321307. The next prime is 66505162321343. The reversal of 66505162321311 is 11312326150566.

It is a happy number.

It is not a de Polignac number, because 66505162321311 - 2² = 66505162321307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66505162321391) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 901190335 + ... + 901264128.

It is an arithmetic number, because the mean of its divisors is an integer number (4315075986816).

Almost surely, 2^{66505162321311} is an apocalyptic number.

66505162321311 is a deficient number, since it is larger than the sum of its proper divisors (37056661362273).

66505162321311 is a wasteful number, since it uses less digits than its factorization.

66505162321311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1802454731 (or 1802454724 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 42.

Adding to 66505162321311 its reverse (11312326150566), we get a palindrome (77817488471877).

The spelling of 66505162321311 in words is "sixty-six trillion, five hundred five billion, one hundred sixty-two million, three hundred twenty-one thousand, three hundred eleven".