2661435121 has 4 divisors (see below), whose sum is σ = 2711650932. Its totient is φ = 2611219312.

The previous prime is 2661435103. The next prime is 2661435137. The reversal of 2661435121 is 1215341662.

It is a happy number.

2661435121 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1626912225 + 1034522896 = 40335^2 + 32164^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661435121 - 2²⁷ = 2527217393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661435151) 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, 25107826 + ... + 25107931.

It is an arithmetic number, because the mean of its divisors is an integer number (677912733).

Almost surely, 2^2661435121 is an apocalyptic number.

It is an amenable number.

2661435121 is a deficient number, since it is larger than the sum of its proper divisors (50215811).

2661435121 is an equidigital number, since it uses as much as digits as its factorization.

2661435121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50215810.

The product of its digits is 8640, while the sum is 31.

The square root of 2661435121 is about 51589.0988581890. The cubic root of 2661435121 is about 1385.8151172411.

Adding to 2661435121 its reverse (1215341662), we get a palindrome (3876776783).

The spelling of 2661435121 in words is "two billion, six hundred sixty-one million, four hundred thirty-five thousand, one hundred twenty-one".