645453321622 has 32 divisors (see below), whose sum is σ = 1011112833024. Its totient is φ = 308764526400.

The previous prime is 645453321619. The next prime is 645453321629. The reversal of 645453321622 is 226123354546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645453321629) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 961747 + ... + 1488577.

It is an arithmetic number, because the mean of its divisors is an integer number (31597276032).

Almost surely, 2^645453321622 is an apocalyptic number.

645453321622 is a deficient number, since it is larger than the sum of its proper divisors (365659511402).

645453321622 is a wasteful number, since it uses less digits than its factorization.

645453321622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527164.

The product of its digits is 1036800, while the sum is 43.

The spelling of 645453321622 in words is "six hundred forty-five billion, four hundred fifty-three million, three hundred twenty-one thousand, six hundred twenty-two".