2117555780 has 12 divisors (see below), whose sum is σ = 4446867180. Its totient is φ = 847022304.

The previous prime is 2117555761. The next prime is 2117555801. The reversal of 2117555780 is 875557112.

It can be written as a sum of positive squares in 2 ways, for example, as 1525996096 + 591559684 = 39064^2 + 24322^2 .

It is a super-2 number, since 2×2117555780² = 8968084962822816800, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52938875 + ... + 52938914.

It is an arithmetic number, because the mean of its divisors is an integer number (370572265).

Almost surely, 2^2117555780 is an apocalyptic number.

2117555780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2117555780 is an abundant number, since it is smaller than the sum of its proper divisors (2329311400).

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

2117555780 is a wasteful number, since it uses less digits than its factorization.

2117555780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105877798 (or 105877796 counting only the distinct ones).

The product of its (nonzero) digits is 98000, while the sum is 41.

The square root of 2117555780 is about 46016.9075449448. The cubic root of 2117555780 is about 1284.1377693679.

The spelling of 2117555780 in words is "two billion, one hundred seventeen million, five hundred fifty-five thousand, seven hundred eighty".