4161221727780 has 96 divisors (see below), whose sum is σ = 12548255376384. Its totient is φ = 1024254088704.

The previous prime is 4161221727763. The next prime is 4161221727787. The reversal of 4161221727780 is 877271221614.

It is not an unprimeable number, because it can be changed into a prime (4161221727787) 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, 18932877 + ... + 19151403.

It is an arithmetic number, because the mean of its divisors is an integer number (130710993504).

Almost surely, 2^{4161221727780} is an apocalyptic number.

It is an amenable number.

4161221727780 is an abundant number, since it is smaller than the sum of its proper divisors (8387033648604).

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

4161221727780 is a wasteful number, since it uses less digits than its factorization.

4161221727780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242965 (or 242963 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 48.

The spelling of 4161221727780 in words is "four trillion, one hundred sixty-one billion, two hundred twenty-one million, seven hundred twenty-seven thousand, seven hundred eighty".