221660146030500 has 288 divisors, whose sum is σ = 730005040058112. Its totient is φ = 56513179008000.

The previous prime is 221660146030447. The next prime is 221660146030549. The reversal of 221660146030500 is 5030641066122.

221660146030500 is a `hidden beast` number, since 2 + 2 + 1 + 6 + 6 + 0 + 146 + 0 + 3 + 0 + 500 = 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 223167979 + ... + 224159021.

It is an arithmetic number, because the mean of its divisors is an integer number (2534739722424).

Almost surely, 2^{221660146030500} is an apocalyptic number.

221660146030500 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 221660146030500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365002520029056).

221660146030500 is an abundant number, since it is smaller than the sum of its proper divisors (508344894027612).

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

221660146030500 is a wasteful number, since it uses less digits than its factorization.

221660146030500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993252 (or 993237 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Adding to 221660146030500 its reverse (5030641066122), we get a palindrome (226690787096622).

The spelling of 221660146030500 in words is "two hundred twenty-one trillion, six hundred sixty billion, one hundred forty-six million, thirty thousand, five hundred".