645112645522 has 8 divisors (see below), whose sum is σ = 993822183756. Its totient is φ = 313838584272.

The previous prime is 645112645511. The next prime is 645112645537. The reversal of 645112645522 is 225546211546.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 643670848681 + 1441796841 = 802291^2 + 37971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4358869153 + ... + 4358869300.

Almost surely, 2^645112645522 is an apocalyptic number.

645112645522 is a deficient number, since it is larger than the sum of its proper divisors (348709538234).

645112645522 is a wasteful number, since it uses less digits than its factorization.

645112645522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8717738492.

The product of its digits is 576000, while the sum is 43.

The spelling of 645112645522 in words is "six hundred forty-five billion, one hundred twelve million, six hundred forty-five thousand, five hundred twenty-two".