22665552840 has 768 divisors, whose sum is σ = 91514142720. Its totient is φ = 4938071040.

The previous prime is 22665552781. The next prime is 22665552853. The reversal of 22665552840 is 4825556622.

It is a happy number.

22665552840 is a `hidden beast` number, since 2 + 26 + 65 + 5 + 528 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 178468857 + ... + 178468983.

It is an arithmetic number, because the mean of its divisors is an integer number (119159040).

Almost surely, 2^22665552840 is an apocalyptic number.

22665552840 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 22665552840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45757071360).

22665552840 is an abundant number, since it is smaller than the sum of its proper divisors (68848589880).

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

22665552840 is a wasteful number, since it uses less digits than its factorization.

22665552840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264 (or 248 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 45.

The spelling of 22665552840 in words is "twenty-two billion, six hundred sixty-five million, five hundred fifty-two thousand, eight hundred forty".