645234052240 has 40 divisors (see below), whose sum is σ = 1579125447360. Its totient is φ = 244509745536.

The previous prime is 645234052237. The next prime is 645234052283. The reversal of 645234052240 is 42250432546.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 645234052240.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 212246524 + ... + 212249563.

It is an arithmetic number, because the mean of its divisors is an integer number (39478136184).

Almost surely, 2^645234052240 is an apocalyptic number.

It is an amenable number.

645234052240 is an abundant number, since it is smaller than the sum of its proper divisors (933891395120).

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

645234052240 is a wasteful number, since it uses less digits than its factorization.

645234052240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424496119 (or 424496113 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 37.

Adding to 645234052240 its reverse (42250432546), we get a palindrome (687484484786).

The spelling of 645234052240 in words is "six hundred forty-five billion, two hundred thirty-four million, fifty-two thousand, two hundred forty".