22061571840 has 1944 divisors, whose sum is σ = 108778859280. Its totient is φ = 4087480320.

The previous prime is 22061571839. The next prime is 22061571841. The reversal of 22061571840 is 4817516022.

22061571840 is a `hidden beast` number, since 2 + 2 + 0 + 6 + 1 + 571 + 84 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (22061571839) and next prime (22061571841).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 22061571795 and 22061571804.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22061571841) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 1161135351 + ... + 1161135369.

Almost surely, 2^22061571840 is an apocalyptic number.

22061571840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22061571840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54389429640).

22061571840 is an abundant number, since it is smaller than the sum of its proper divisors (86717287440).

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

22061571840 is a wasteful number, since it uses less digits than its factorization.

22061571840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 22061571840 in words is "twenty-two billion, sixty-one million, five hundred seventy-one thousand, eight hundred forty".