645436331430 has 32 divisors (see below), whose sum is σ = 1689869668608. Its totient is φ = 156469413600.

The previous prime is 645436331369. The next prime is 645436331437. The reversal of 645436331430 is 34133634546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645436331437) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 977933506 + ... + 977934165.

It is an arithmetic number, because the mean of its divisors is an integer number (52808427144).

Almost surely, 2^645436331430 is an apocalyptic number.

645436331430 is an abundant number, since it is smaller than the sum of its proper divisors (1044433337178).

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

645436331430 is a wasteful number, since it uses less digits than its factorization.

645436331430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955867692.

The product of its (nonzero) digits is 933120, while the sum is 42.

Adding to 645436331430 its reverse (34133634546), we get a palindrome (679569965976).

The spelling of 645436331430 in words is "six hundred forty-five billion, four hundred thirty-six million, three hundred thirty-one thousand, four hundred thirty".