66193239165 has 16 divisors (see below), whose sum is σ = 108372187968. Its totient is φ = 34482059136.

The previous prime is 66193239163. The next prime is 66193239169. The reversal of 66193239165 is 56193239166.

It is a happy number.

It is not a de Polignac number, because 66193239165 - 2¹ = 66193239163 is a prime.

It is a super-2 number, since 2×66193239165² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66193239163) 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, 51311944 + ... + 51313233.

It is an arithmetic number, because the mean of its divisors is an integer number (6773261748).

Almost surely, 2^66193239165 is an apocalyptic number.

It is an amenable number.

66193239165 is a deficient number, since it is larger than the sum of its proper divisors (42178948803).

66193239165 is a wasteful number, since it uses less digits than its factorization.

66193239165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102625228.

The product of its digits is 1574640, while the sum is 51.

Subtracting from 66193239165 its reverse (56193239166), we obtain a palindrome (9999999999).

The spelling of 66193239165 in words is "sixty-six billion, one hundred ninety-three million, two hundred thirty-nine thousand, one hundred sixty-five".