642223446864 has 20 divisors (see below), whose sum is σ = 1659077237856. Its totient is φ = 214074482272.

The previous prime is 642223446803. The next prime is 642223446883. The reversal of 642223446864 is 468644322246.

It is a super-4 number, since 4×642223446864⁴ (a number of 48 digits) contains 4444 as substring.

It is a nude number because it is divisible by every one of its digits.

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, 6689827524 + ... + 6689827619.

Almost surely, 2^642223446864 is an apocalyptic number.

It is an amenable number.

642223446864 is an abundant number, since it is smaller than the sum of its proper divisors (1016853790992).

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

642223446864 is a wasteful number, since it uses less digits than its factorization.

642223446864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13379655154 (or 13379655148 counting only the distinct ones).

The product of its digits is 10616832, while the sum is 51.

The spelling of 642223446864 in words is "six hundred forty-two billion, two hundred twenty-three million, four hundred forty-six thousand, eight hundred sixty-four".