2166120251413 has 8 divisors (see below), whose sum is σ = 2186096635800. Its totient is φ = 2146145753088.

The previous prime is 2166120251369. The next prime is 2166120251443. The reversal of 2166120251413 is 3141520216612.

It can be written as a sum of positive squares in 4 ways, for example, as 85839038289 + 2080281213124 = 292983^2 + 1442318^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2166120251413 - 2²¹ = 2166118154261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2166120251443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1890345 + ... + 2811697.

It is an arithmetic number, because the mean of its divisors is an integer number (273262079475).

Almost surely, 2^{2166120251413} is an apocalyptic number.

It is an amenable number.

2166120251413 is a deficient number, since it is larger than the sum of its proper divisors (19976384387).

2166120251413 is a wasteful number, since it uses less digits than its factorization.

2166120251413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 943031.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 2166120251413 in words is "two trillion, one hundred sixty-six billion, one hundred twenty million, two hundred fifty-one thousand, four hundred thirteen".