646242105599 has 4 divisors (see below), whose sum is σ = 646268868240. Its totient is φ = 646215342960.

The previous prime is 646242105571. The next prime is 646242105623. The reversal of 646242105599 is 995501242646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646242105599 - 2²⁸ = 645973670143 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 646242105599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646242105539) 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, 13345067 + ... + 13393404.

It is an arithmetic number, because the mean of its divisors is an integer number (161567217060).

Almost surely, 2^646242105599 is an apocalyptic number.

646242105599 is a deficient number, since it is larger than the sum of its proper divisors (26762641).

646242105599 is a wasteful number, since it uses less digits than its factorization.

646242105599 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26762640.

The product of its (nonzero) digits is 4665600, while the sum is 53.

The spelling of 646242105599 in words is "six hundred forty-six billion, two hundred forty-two million, one hundred five thousand, five hundred ninety-nine".