645442532452 has 12 divisors (see below), whose sum is σ = 1129537456236. Its totient is φ = 322717544960.

The previous prime is 645442532387. The next prime is 645442532459. The reversal of 645442532452 is 254235244546.

It can be written as a sum of positive squares in 2 ways, for example, as 503339167296 + 142103365156 = 709464^2 + 376966^2 .

It is not an unprimeable number, because it can be changed into a prime (645442532459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 519949 + ... + 1249492.

It is an arithmetic number, because the mean of its divisors is an integer number (94128121353).

Almost surely, 2^645442532452 is an apocalyptic number.

It is an amenable number.

645442532452 is a deficient number, since it is larger than the sum of its proper divisors (484094923784).

645442532452 is a wasteful number, since it uses less digits than its factorization.

645442532452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860638 (or 1860636 counting only the distinct ones).

The product of its digits is 4608000, while the sum is 46.

Adding to 645442532452 its reverse (254235244546), we get a palindrome (899677776998).

The spelling of 645442532452 in words is "six hundred forty-five billion, four hundred forty-two million, five hundred thirty-two thousand, four hundred fifty-two".