645431130450 has 72 divisors (see below), whose sum is σ = 1734792533136. Its totient is φ = 172042092000.

The previous prime is 645431130361. The next prime is 645431130451. The reversal of 645431130450 is 54031134546.

645431130450 is a `hidden beast` number, since 6 + 45 + 4 + 31 + 130 + 450 = 666.

It is not an unprimeable number, because it can be changed into a prime (645431130451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 764485 + ... + 1369415.

It is an arithmetic number, because the mean of its divisors is an integer number (24094340738).

Almost surely, 2^645431130450 is an apocalyptic number.

645431130450 is an abundant number, since it is smaller than the sum of its proper divisors (1089361402686).

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

645431130450 is a wasteful number, since it uses less digits than its factorization.

645431130450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 607320 (or 607312 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

Adding to 645431130450 its reverse (54031134546), we get a palindrome (699462264996).

The spelling of 645431130450 in words is "six hundred forty-five billion, four hundred thirty-one million, one hundred thirty thousand, four hundred fifty".