640223165212 has 24 divisors (see below), whose sum is σ = 1124217045504. Its totient is φ = 319018821312.

The previous prime is 640223165189. The next prime is 640223165227. The reversal of 640223165212 is 212561322046.

It is a congruent number.

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, 4966518 + ... + 5093794.

It is an arithmetic number, because the mean of its divisors is an integer number (46842376896).

Almost surely, 2^640223165212 is an apocalyptic number.

It is an amenable number.

640223165212 is a deficient number, since it is larger than the sum of its proper divisors (483993880292).

640223165212 is a wasteful number, since it uses less digits than its factorization.

640223165212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131565 (or 131563 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 640223165212 its reverse (212561322046), we get a palindrome (852784487258).

The spelling of 640223165212 in words is "six hundred forty billion, two hundred twenty-three million, one hundred sixty-five thousand, two hundred twelve".