645442055430 has 64 divisors (see below), whose sum is σ = 1584079580160. Its totient is φ = 168236457984.

The previous prime is 645442055399. The next prime is 645442055507. The reversal of 645442055430 is 34550244546.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 786657 + ... + 1381923.

It is an arithmetic number, because the mean of its divisors is an integer number (24751243440).

Almost surely, 2^645442055430 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645442055430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792039790080).

645442055430 is an abundant number, since it is smaller than the sum of its proper divisors (938637524730).

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

645442055430 is a wasteful number, since it uses less digits than its factorization.

645442055430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 596093.

The product of its (nonzero) digits is 1152000, while the sum is 42.

Adding to 645442055430 its reverse (34550244546), we get a palindrome (679992299976).

The spelling of 645442055430 in words is "six hundred forty-five billion, four hundred forty-two million, fifty-five thousand, four hundred thirty".