646024066123 has 4 divisors (see below), whose sum is σ = 646035580288. Its totient is φ = 646012551960.

The previous prime is 646024066097. The next prime is 646024066187. The reversal of 646024066123 is 321660420646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321660420646 = 2 ⋅160830210323.

It is a cyclic number.

It is not a de Polignac number, because 646024066123 - 2²⁹ = 645487195211 is a prime.

It is a super-2 number, since 2×646024066123² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646024036123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5672508 + ... + 5785273.

It is an arithmetic number, because the mean of its divisors is an integer number (161508895072).

Almost surely, 2^646024066123 is an apocalyptic number.

646024066123 is a deficient number, since it is larger than the sum of its proper divisors (11514165).

646024066123 is a wasteful number, since it uses less digits than its factorization.

646024066123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11514164.

The product of its (nonzero) digits is 248832, while the sum is 40.

Adding to 646024066123 its reverse (321660420646), we get a palindrome (967684486769).

The spelling of 646024066123 in words is "six hundred forty-six billion, twenty-four million, sixty-six thousand, one hundred twenty-three".