2665215989 has 2 divisors, whose sum is σ = 2665215990. Its totient is φ = 2665215988.

The previous prime is 2665215893. The next prime is 2665216003. The reversal of 2665215989 is 9895125662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2478347089 + 186868900 = 49783^2 + 13670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665215989 - 2¹² = 2665211893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2665215989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2665215589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332607994 + 1332607995.

It is an arithmetic number, because the mean of its divisors is an integer number (1332607995).

Almost surely, 2^2665215989 is an apocalyptic number.

It is an amenable number.

2665215989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665215989 is an equidigital number, since it uses as much as digits as its factorization.

2665215989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 53.

The square root of 2665215989 is about 51625.7299125155. The cubic root of 2665215989 is about 1386.4710421600.

The spelling of 2665215989 in words is "two billion, six hundred sixty-five million, two hundred fifteen thousand, nine hundred eighty-nine".