2108769206545 has 4 divisors (see below), whose sum is σ = 2530523047860. Its totient is φ = 1687015365232.

The previous prime is 2108769206483. The next prime is 2108769206587. The reversal of 2108769206545 is 5456029678012.

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 1332113005584 + 776656200961 = 1154172^2 + 881281^2 .

It is a cyclic number.

It is not a de Polignac number, because 2108769206545 - 2¹⁹ = 2108768682257 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210876920650 + ... + 210876920659.

It is an arithmetic number, because the mean of its divisors is an integer number (632630761965).

Almost surely, 2^{2108769206545} is an apocalyptic number.

It is an amenable number.

2108769206545 is a deficient number, since it is larger than the sum of its proper divisors (421753841315).

2108769206545 is an equidigital number, since it uses as much as digits as its factorization.

2108769206545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421753841314.

The product of its (nonzero) digits is 7257600, while the sum is 55.

The spelling of 2108769206545 in words is "two trillion, one hundred eight billion, seven hundred sixty-nine million, two hundred six thousand, five hundred forty-five".