646245222542646 has 16 divisors (see below), whose sum is σ = 1292572596831024. Its totient is φ = 215401382223264.

The previous prime is 646245222542629. The next prime is 646245222542681.

646245222542646 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 646245222542646.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3422887141 + ... + 3423075936.

It is an arithmetic number, because the mean of its divisors is an integer number (80785787301939).

Almost surely, 2^{646245222542646} is an apocalyptic number.

646245222542646 is an abundant number, since it is smaller than the sum of its proper divisors (646327374288378).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646245222542646 is a wasteful number, since it uses less digits than its factorization.

646245222542646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6845978815.

The product of its digits is 265420800, while the sum is 60.

The spelling of 646245222542646 in words is "six hundred forty-six trillion, two hundred forty-five billion, two hundred twenty-two million, five hundred forty-two thousand, six hundred forty-six".