2180685593881 has 4 divisors (see below), whose sum is σ = 2180801182500. Its totient is φ = 2180570005264.

The previous prime is 2180685593851. The next prime is 2180685593897. The reversal of 2180685593881 is 1883955860812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2047142854656 + 133542739225 = 1430784^2 + 365435^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2180685593881 is a prime.

It is a super-2 number, since 2×2180685593881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2180685593831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57766006 + ... + 57803743.

It is an arithmetic number, because the mean of its divisors is an integer number (545200295625).

Almost surely, 2^{2180685593881} is an apocalyptic number.

It is an amenable number.

2180685593881 is a deficient number, since it is larger than the sum of its proper divisors (115588619).

2180685593881 is a wasteful number, since it uses less digits than its factorization.

2180685593881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115588618.

The product of its (nonzero) digits is 33177600, while the sum is 64.

The spelling of 2180685593881 in words is "two trillion, one hundred eighty billion, six hundred eighty-five million, five hundred ninety-three thousand, eight hundred eighty-one".