2666410121 has 4 divisors (see below), whose sum is σ = 2666951700. Its totient is φ = 2665868544.

The previous prime is 2666410093. The next prime is 2666410127. The reversal of 2666410121 is 1210146662.

2666410121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1210146662 = 2 ⋅605073331.

It can be written as a sum of positive squares in 2 ways, for example, as 737882896 + 1928527225 = 27164^2 + 43915^2 .

It is a cyclic number.

It is not a de Polignac number, because 2666410121 - 2⁶ = 2666410057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2666410127) 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, 263336 + ... + 273273.

It is an arithmetic number, because the mean of its divisors is an integer number (666737925).

Almost surely, 2^2666410121 is an apocalyptic number.

It is an amenable number.

2666410121 is a deficient number, since it is larger than the sum of its proper divisors (541579).

2666410121 is an equidigital number, since it uses as much as digits as its factorization.

2666410121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 541578.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 2666410121 is about 51637.2938969501. The cubic root of 2666410121 is about 1386.6780775675.

Adding to 2666410121 its reverse (1210146662), we get a palindrome (3876556783).

The spelling of 2666410121 in words is "two billion, six hundred sixty-six million, four hundred ten thousand, one hundred twenty-one".