640256111452 has 12 divisors (see below), whose sum is σ = 1127322111496. Its totient is φ = 318164079600.

The previous prime is 640256111437. The next prime is 640256111471. The reversal of 640256111452 is 254111652046.

640256111452 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490993299 + ... + 490994602.

Almost surely, 2^640256111452 is an apocalyptic number.

It is an amenable number.

640256111452 is a deficient number, since it is larger than the sum of its proper divisors (487066000044).

640256111452 is a wasteful number, since it uses less digits than its factorization.

640256111452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 981988068 (or 981988066 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

Adding to 640256111452 its reverse (254111652046), we get a palindrome (894367763498).

The spelling of 640256111452 in words is "six hundred forty billion, two hundred fifty-six million, one hundred eleven thousand, four hundred fifty-two".