2166071267705 has 4 divisors (see below), whose sum is σ = 2599285521252. Its totient is φ = 1732857014160.

The previous prime is 2166071267683. The next prime is 2166071267707. The reversal of 2166071267705 is 5077621706612.

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 1623715611001 + 542355656704 = 1274251^2 + 736448^2 .

It is not a de Polignac number, because 2166071267705 - 2⁸ = 2166071267449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166071267707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216607126766 + ... + 216607126775.

It is an arithmetic number, because the mean of its divisors is an integer number (649821380313).

Almost surely, 2^{2166071267705} is an apocalyptic number.

It is an amenable number.

2166071267705 is a deficient number, since it is larger than the sum of its proper divisors (433214253547).

2166071267705 is an equidigital number, since it uses as much as digits as its factorization.

2166071267705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433214253546.

The product of its (nonzero) digits is 1481760, while the sum is 50.

The spelling of 2166071267705 in words is "two trillion, one hundred sixty-six billion, seventy-one million, two hundred sixty-seven thousand, seven hundred five".