645606556022 has 16 divisors (see below), whose sum is σ = 1009627811280. Its totient is φ = 309347237472.

The previous prime is 645606555929. The next prime is 645606556079. The reversal of 645606556022 is 220655606546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70816697 + ... + 70825812.

It is an arithmetic number, because the mean of its divisors is an integer number (63101738205).

Almost surely, 2^645606556022 is an apocalyptic number.

645606556022 is a deficient number, since it is larger than the sum of its proper divisors (364021255258).

645606556022 is a wasteful number, since it uses less digits than its factorization.

645606556022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141642607.

The product of its (nonzero) digits is 2592000, while the sum is 47.

The spelling of 645606556022 in words is "six hundred forty-five billion, six hundred six million, five hundred fifty-six thousand, twenty-two".