2180991405124 has 81 divisors (see below), whose sum is σ = 4564716236829. Its totient is φ = 909129160800.

The previous prime is 2180991405101. The next prime is 2180991405199. The reversal of 2180991405124 is 4215041990812.

The square root of 2180991405124 is 1476818.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1951581060100 + 229410345024 = 1396990^2 + 478968^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 764990299 + ... + 764993149.

Almost surely, 2^{2180991405124} is an apocalyptic number.

2180991405124 is the 1476818-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2180991405124

2180991405124 is an abundant number, since it is smaller than the sum of its proper divisors (2383724831705).

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

2180991405124 is an frugal number, since it uses more digits than its factorization.

2180991405124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5794 (or 2897 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 2180991405124 in words is "two trillion, one hundred eighty billion, nine hundred ninety-one million, four hundred five thousand, one hundred twenty-four".