640200944452 has 6 divisors (see below), whose sum is σ = 1120351652798. Its totient is φ = 320100472224.

The previous prime is 640200944447. The next prime is 640200944491. The reversal of 640200944452 is 254449002046.

It can be written as a sum of positive squares in only one way, i.e., 347232061696 + 292968882756 = 589264^2 + 541266^2 .

It is a super-3 number, since 3×640200944452³ (a number of 36 digits) contains 333 as substring.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 80025118053 + ... + 80025118060.

Almost surely, 2^640200944452 is an apocalyptic number.

It is an amenable number.

640200944452 is a deficient number, since it is larger than the sum of its proper divisors (480150708346).

640200944452 is a wasteful number, since it uses less digits than its factorization.

640200944452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160050236117 (or 160050236115 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 40.

Adding to 640200944452 its reverse (254449002046), we get a palindrome (894649946498).

The spelling of 640200944452 in words is "six hundred forty billion, two hundred million, nine hundred forty-four thousand, four hundred fifty-two".