2665398653 has 2 divisors, whose sum is σ = 2665398654. Its totient is φ = 2665398652.

The previous prime is 2665398587. The next prime is 2665398683. The reversal of 2665398653 is 3568935662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1628687449 + 1036711204 = 40357^2 + 32198^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2665398653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2665398595 and 2665398604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2665398683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332699326 + 1332699327.

It is an arithmetic number, because the mean of its divisors is an integer number (1332699327).

Almost surely, 2^2665398653 is an apocalyptic number.

It is an amenable number.

2665398653 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665398653 is an equidigital number, since it uses as much as digits as its factorization.

2665398653 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6998400, while the sum is 53.

The square root of 2665398653 is about 51627.4990000484. The cubic root of 2665398653 is about 1386.5027159608.

The spelling of 2665398653 in words is "two billion, six hundred sixty-five million, three hundred ninety-eight thousand, six hundred fifty-three".