2106581341865 has 64 divisors (see below), whose sum is σ = 3418875855360. Its totient is φ = 1203330263040.

The previous prime is 2106581341849. The next prime is 2106581341867. The reversal of 2106581341865 is 5681431856012.

It is not a de Polignac number, because 2106581341865 - 2⁴ = 2106581341849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2106581341867) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 850430 + ... + 2221799.

It is an arithmetic number, because the mean of its divisors is an integer number (53419935240).

Almost surely, 2^{2106581341865} is an apocalyptic number.

It is an amenable number.

2106581341865 is a deficient number, since it is larger than the sum of its proper divisors (1312294513495).

2106581341865 is a wasteful number, since it uses less digits than its factorization.

2106581341865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3072402.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 2106581341865 in words is "two trillion, one hundred six billion, five hundred eighty-one million, three hundred forty-one thousand, eight hundred sixty-five".