22221661554 has 128 divisors (see below), whose sum is σ = 54805870080. Its totient is φ = 6638303232.

The previous prime is 22221661543. The next prime is 22221661589. The reversal of 22221661554 is 45516612222.

22221661554 is a `hidden beast` number, since 2 + 2 + 22 + 16 + 615 + 5 + 4 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4917304 + ... + 4921820.

It is an arithmetic number, because the mean of its divisors is an integer number (428170860).

Almost surely, 2^22221661554 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22221661554, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27402935040).

22221661554 is an abundant number, since it is smaller than the sum of its proper divisors (32584208526).

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

22221661554 is a wasteful number, since it uses less digits than its factorization.

22221661554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4801 (or 4795 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The spelling of 22221661554 in words is "twenty-two billion, two hundred twenty-one million, six hundred sixty-one thousand, five hundred fifty-four".