645246206446 has 16 divisors (see below), whose sum is σ = 977064160176. Its totient is φ = 319559075136.

The previous prime is 645246206399. The next prime is 645246206453. The reversal of 645246206446 is 644602642546.

It is a self number, because there is not a number n which added to its sum of digits gives 645246206446.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1193170 + ... + 1647466.

It is an arithmetic number, because the mean of its divisors is an integer number (61066510011).

Almost surely, 2^645246206446 is an apocalyptic number.

645246206446 is a deficient number, since it is larger than the sum of its proper divisors (331817953730).

645246206446 is a wasteful number, since it uses less digits than its factorization.

645246206446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461043.

The product of its (nonzero) digits is 6635520, while the sum is 49.

The spelling of 645246206446 in words is "six hundred forty-five billion, two hundred forty-six million, two hundred six thousand, four hundred forty-six".