640223485168 has 20 divisors (see below), whose sum is σ = 1240445414448. Its totient is φ = 320108539520.

The previous prime is 640223485141. The next prime is 640223485177. The reversal of 640223485168 is 861584322046.

It is a super-2 number, since 2×640223485168² (a number of 24 digits) contains 22 as substring.

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, 2972148 + ... + 3180268.

Almost surely, 2^640223485168 is an apocalyptic number.

It is an amenable number.

640223485168 is a deficient number, since it is larger than the sum of its proper divisors (600221929280).

640223485168 is a wasteful number, since it uses less digits than its factorization.

640223485168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400392 (or 400386 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 49.

The spelling of 640223485168 in words is "six hundred forty billion, two hundred twenty-three million, four hundred eighty-five thousand, one hundred sixty-eight".