66123464644223 has 24 divisors (see below), whose sum is σ = 80326003390848. Its totient is φ = 54170770836336.

The previous prime is 66123464644187. The next prime is 66123464644229. The reversal of 66123464644223 is 32244646432166.

It is a happy number.

It is not a de Polignac number, because 66123464644223 - 2³⁸ = 65848586737279 is a prime.

It is a super-2 number, since 2×66123464644223² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66123464644229) 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, 21419261 + ... + 24311142.

It is an arithmetic number, because the mean of its divisors is an integer number (3346916807952).

Almost surely, 2^{66123464644223} is an apocalyptic number.

66123464644223 is a deficient number, since it is larger than the sum of its proper divisors (14202538746625).

66123464644223 is a wasteful number, since it uses less digits than its factorization.

66123464644223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45731723 (or 45731716 counting only the distinct ones).

The product of its digits is 23887872, while the sum is 53.

The spelling of 66123464644223 in words is "sixty-six trillion, one hundred twenty-three billion, four hundred sixty-four million, six hundred forty-four thousand, two hundred twenty-three".