2661337121 has 2 divisors, whose sum is σ = 2661337122. Its totient is φ = 2661337120.

The previous prime is 2661337117. The next prime is 2661337157. The reversal of 2661337121 is 1217331662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2645970721 + 15366400 = 51439^2 + 3920^2 .

It is a cyclic number.

It is not a de Polignac number, because 2661337121 - 2² = 2661337117 is a prime.

It is a super-2 number, since 2×2661337121² = 14165430543225137282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2661337171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330668560 + 1330668561.

It is an arithmetic number, because the mean of its divisors is an integer number (1330668561).

Almost surely, 2^2661337121 is an apocalyptic number.

It is an amenable number.

2661337121 is a deficient number, since it is larger than the sum of its proper divisors (1).

2661337121 is an equidigital number, since it uses as much as digits as its factorization.

2661337121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 2661337121 is about 51588.1490363824. The cubic root of 2661337121 is about 1385.7981074272.

Adding to 2661337121 its reverse (1217331662), we get a palindrome (3878668783).

The spelling of 2661337121 in words is "two billion, six hundred sixty-one million, three hundred thirty-seven thousand, one hundred twenty-one".