2180681985 has 32 divisors (see below), whose sum is σ = 3552451200. Its totient is φ = 1141977600.

The previous prime is 2180681959. The next prime is 2180682017. The reversal of 2180681985 is 5891860812.

It is not a de Polignac number, because 2180681985 - 2¹⁴ = 2180665601 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 630541 + ... + 633989.

It is an arithmetic number, because the mean of its divisors is an integer number (111014100).

Almost surely, 2^2180681985 is an apocalyptic number.

It is an amenable number.

2180681985 is a deficient number, since it is larger than the sum of its proper divisors (1371769215).

2180681985 is a wasteful number, since it uses less digits than its factorization.

2180681985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4209.

The product of its (nonzero) digits is 276480, while the sum is 48.

The square root of 2180681985 is about 46697.7728055632. The cubic root of 2180681985 is about 1296.7734550850.

The spelling of 2180681985 in words is "two billion, one hundred eighty million, six hundred eighty-one thousand, nine hundred eighty-five".