22000951998 has 64 divisors (see below), whose sum is σ = 51513523200. Its totient is φ = 6941013120.

The previous prime is 22000951997. The next prime is 22000952003. The reversal of 22000951998 is 89915900022.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22000951991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1121958 + ... + 1141398.

It is an arithmetic number, because the mean of its divisors is an integer number (804898800).

Almost surely, 2^22000951998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22000951998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25756761600).

22000951998 is an abundant number, since it is smaller than the sum of its proper divisors (29512571202).

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

22000951998 is a wasteful number, since it uses less digits than its factorization.

22000951998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20574 (or 20568 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The spelling of 22000951998 in words is "twenty-two billion, nine hundred fifty-one thousand, nine hundred ninety-eight".