645452344012 has 24 divisors (see below), whose sum is σ = 1318370747904. Its totient is φ = 270736848912.

The previous prime is 645452343971. The next prime is 645452344027. The reversal of 645452344012 is 210443254546.

It is a super-2 number, since 2×645452344012² (a number of 24 digits) contains 22 as substring.

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, 245231338 + ... + 245233969.

It is an arithmetic number, because the mean of its divisors is an integer number (54932114496).

Almost surely, 2^645452344012 is an apocalyptic number.

It is an amenable number.

645452344012 is an abundant number, since it is smaller than the sum of its proper divisors (672918403892).

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

645452344012 is a wasteful number, since it uses less digits than its factorization.

645452344012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490465365 (or 490465363 counting only the distinct ones).

The product of its (nonzero) digits is 460800, while the sum is 40.

Adding to 645452344012 its reverse (210443254546), we get a palindrome (855895598558).

The spelling of 645452344012 in words is "six hundred forty-five billion, four hundred fifty-two million, three hundred forty-four thousand, twelve".