645423446255 has 64 divisors (see below), whose sum is σ = 915591168000. Its totient is φ = 427642478208.

The previous prime is 645423446237. The next prime is 645423446263. The reversal of 645423446255 is 552644324546.

It is a cyclic number.

It is not a de Polignac number, because 645423446255 - 2⁶ = 645423446191 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 66267176 + ... + 66276914.

It is an arithmetic number, because the mean of its divisors is an integer number (14306112000).

Almost surely, 2^645423446255 is an apocalyptic number.

645423446255 is a deficient number, since it is larger than the sum of its proper divisors (270167721745).

645423446255 is a wasteful number, since it uses less digits than its factorization.

645423446255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10356.

The product of its digits is 13824000, while the sum is 50.

The spelling of 645423446255 in words is "six hundred forty-five billion, four hundred twenty-three million, four hundred forty-six thousand, two hundred fifty-five".