646466423123 has 4 divisors (see below), whose sum is σ = 647444436528. Its totient is φ = 645488409720.

The previous prime is 646466423089. The next prime is 646466423137. The reversal of 646466423123 is 321324664646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 321324664646 = 2 ⋅160662332323.

It is a cyclic number.

It is not a de Polignac number, because 646466423123 - 2²⁶ = 646399314259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646466428123) 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, 489005711 + ... + 489007032.

It is an arithmetic number, because the mean of its divisors is an integer number (161861109132).

Almost surely, 2^646466423123 is an apocalyptic number.

646466423123 is a deficient number, since it is larger than the sum of its proper divisors (978013405).

646466423123 is an equidigital number, since it uses as much as digits as its factorization.

646466423123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978013404.

The product of its digits is 2985984, while the sum is 47.

The spelling of 646466423123 in words is "six hundred forty-six billion, four hundred sixty-six million, four hundred twenty-three thousand, one hundred twenty-three".