645064354612 has 12 divisors (see below), whose sum is σ = 1195266304260. Its totient is φ = 303559696256.

The previous prime is 645064354609. The next prime is 645064354637. The reversal of 645064354612 is 216453460546.

It can be written as a sum of positive squares in 2 ways, for example, as 200394103716 + 444670250896 = 447654^2 + 666836^2 .

It is a super-2 number, since 2×645064354612² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4743120187 + ... + 4743120322.

It is an arithmetic number, because the mean of its divisors is an integer number (99605525355).

Almost surely, 2^645064354612 is an apocalyptic number.

It is an amenable number.

645064354612 is a deficient number, since it is larger than the sum of its proper divisors (550201949648).

645064354612 is a wasteful number, since it uses less digits than its factorization.

645064354612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9486240530 (or 9486240528 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 46.

The spelling of 645064354612 in words is "six hundred forty-five billion, sixty-four million, three hundred fifty-four thousand, six hundred twelve".