2100566161745 has 4 divisors (see below), whose sum is σ = 2520679394100. Its totient is φ = 1680452929392.

The previous prime is 2100566161717. The next prime is 2100566161787. The reversal of 2100566161745 is 5471616650012.

It is a happy number.

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 1374118483984 + 726447677761 = 1172228^2 + 852319^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2100566161745 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2100566161696 and 2100566161705.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210056616170 + ... + 210056616179.

It is an arithmetic number, because the mean of its divisors is an integer number (630169848525).

Almost surely, 2^{2100566161745} is an apocalyptic number.

It is an amenable number.

2100566161745 is a deficient number, since it is larger than the sum of its proper divisors (420113232355).

2100566161745 is an equidigital number, since it uses as much as digits as its factorization.

2100566161745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420113232354.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 2100566161745 in words is "two trillion, one hundred billion, five hundred sixty-six million, one hundred sixty-one thousand, seven hundred forty-five".