2166251454217 has 4 divisors (see below), whose sum is σ = 2166442005780. Its totient is φ = 2166060902656.

The previous prime is 2166251454187. The next prime is 2166251454223. The reversal of 2166251454217 is 7124541526612.

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 921016412416 + 1245235041801 = 959696^2 + 1115901^2 .

It is a cyclic number.

It is not a de Polignac number, because 2166251454217 - 2³¹ = 2164103970569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2166201454217) 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, 95258728 + ... + 95281465.

It is an arithmetic number, because the mean of its divisors is an integer number (541610501445).

Almost surely, 2^{2166251454217} is an apocalyptic number.

It is an amenable number.

2166251454217 is a deficient number, since it is larger than the sum of its proper divisors (190551563).

2166251454217 is a wasteful number, since it uses less digits than its factorization.

2166251454217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190551562.

The product of its digits is 806400, while the sum is 46.

The spelling of 2166251454217 in words is "two trillion, one hundred sixty-six billion, two hundred fifty-one million, four hundred fifty-four thousand, two hundred seventeen".