221550623280 has 640 divisors, whose sum is σ = 929469081600. Its totient is φ = 47969832960.

The previous prime is 221550623263. The next prime is 221550623317. The reversal of 221550623280 is 82326055122.

It is a happy number.

221550623280 is a `hidden beast` number, since 2 + 2 + 1 + 5 + 5 + 0 + 623 + 28 + 0 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 23264920 + ... + 23274440.

It is an arithmetic number, because the mean of its divisors is an integer number (1452295440).

Almost surely, 2^221550623280 is an apocalyptic number.

221550623280 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 221550623280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (464734540800).

221550623280 is an abundant number, since it is smaller than the sum of its proper divisors (707918458320).

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

221550623280 is an equidigital number, since it uses as much as digits as its factorization.

221550623280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9581 (or 9557 counting only the distinct ones).

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

The spelling of 221550623280 in words is "two hundred twenty-one billion, five hundred fifty million, six hundred twenty-three thousand, two hundred eighty".