2661938289 has 16 divisors (see below), whose sum is σ = 3961305600. Its totient is φ = 1766663568.

The previous prime is 2661938273. The next prime is 2661938299. The reversal of 2661938289 is 9828391662.

It is not a de Polignac number, because 2661938289 - 2⁴ = 2661938273 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2661938239) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215034 + ... + 227075.

It is an arithmetic number, because the mean of its divisors is an integer number (247581600).

Almost surely, 2^2661938289 is an apocalyptic number.

It is an amenable number.

2661938289 is a deficient number, since it is larger than the sum of its proper divisors (1299367311).

2661938289 is a wasteful number, since it uses less digits than its factorization.

2661938289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442341 (or 442335 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 2661938289 is about 51593.9753168914. The cubic root of 2661938289 is about 1385.9024452991.

The spelling of 2661938289 in words is "two billion, six hundred sixty-one million, nine hundred thirty-eight thousand, two hundred eighty-nine".