22143642858 has 48 divisors (see below), whose sum is σ = 49550136480. Its totient is φ = 7141562208.

The previous prime is 22143642841. The next prime is 22143642869. The reversal of 22143642858 is 85824634122.

22143642858 is a `hidden beast` number, since 2 + 2 + 1 + 4 + 364 + 285 + 8 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26341 + ... + 212087.

It is an arithmetic number, because the mean of its divisors is an integer number (1032294510).

Almost surely, 2^22143642858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22143642858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24775068240).

22143642858 is an abundant number, since it is smaller than the sum of its proper divisors (27406493622).

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

22143642858 is a wasteful number, since it uses less digits than its factorization.

22143642858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185971 (or 185968 counting only the distinct ones).

The product of its digits is 737280, while the sum is 45.

The spelling of 22143642858 in words is "twenty-two billion, one hundred forty-three million, six hundred forty-two thousand, eight hundred fifty-eight".