2175561255220 has 96 divisors (see below), whose sum is σ = 4715232963840. Its totient is φ = 842767134720.

The previous prime is 2175561255173. The next prime is 2175561255227. The reversal of 2175561255220 is 225521655712.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2175561255227) 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, 115020484 + ... + 115039396.

It is an arithmetic number, because the mean of its divisors is an integer number (49117010040).

Almost surely, 2^{2175561255220} is an apocalyptic number.

2175561255220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2175561255220 is an abundant number, since it is smaller than the sum of its proper divisors (2539671708620).

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

2175561255220 is a wasteful number, since it uses less digits than its factorization.

2175561255220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20425 (or 20423 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 43.

The spelling of 2175561255220 in words is "two trillion, one hundred seventy-five billion, five hundred sixty-one million, two hundred fifty-five thousand, two hundred twenty".