645054311550 has 96 divisors (see below), whose sum is σ = 1767256174080. Its totient is φ = 154397318400.

The previous prime is 645054311543. The next prime is 645054311659. The reversal of 645054311550 is 55113450546.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 645054311499 and 645054311508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2343967 + ... + 2604666.

It is an arithmetic number, because the mean of its divisors is an integer number (18408918480).

Almost surely, 2^645054311550 is an apocalyptic number.

645054311550 is an abundant number, since it is smaller than the sum of its proper divisors (1122201862530).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

645054311550 is a wasteful number, since it uses less digits than its factorization.

645054311550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4948738 (or 4948733 counting only the distinct ones).

The product of its (nonzero) digits is 180000, while the sum is 39.

The spelling of 645054311550 in words is "six hundred forty-five billion, fifty-four million, three hundred eleven thousand, five hundred fifty".