221666050432740 has 96 divisors (see below), whose sum is σ = 674936120605824. Its totient is φ = 54130215168000.

The previous prime is 221666050432669. The next prime is 221666050432747. The reversal of 221666050432740 is 47234050666122.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 221666050432740.

It is not an unprimeable number, because it can be changed into a prime (221666050432747) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2936714386 + ... + 2936789865.

It is an arithmetic number, because the mean of its divisors is an integer number (7030584589644).

Almost surely, 2^{221666050432740} is an apocalyptic number.

221666050432740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221666050432740 is an abundant number, since it is smaller than the sum of its proper divisors (453270070173084).

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

221666050432740 is a wasteful number, since it uses less digits than its factorization.

221666050432740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5873504317 (or 5873504315 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 48.

The spelling of 221666050432740 in words is "two hundred twenty-one trillion, six hundred sixty-six billion, fifty million, four hundred thirty-two thousand, seven hundred forty".