5263251661 has 2 divisors, whose sum is σ = 5263251662. Its totient is φ = 5263251660.

The previous prime is 5263251649. The next prime is 5263251671. The reversal of 5263251661 is 1661523625.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4641696900 + 621554761 = 68130^2 + 24931^2 .

It is a cyclic number.

It is not a de Polignac number, because 5263251661 - 2¹¹ = 5263249613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5263251661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5263251671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2631625830 + 2631625831.

It is an arithmetic number, because the mean of its divisors is an integer number (2631625831).

Almost surely, 2^5263251661 is an apocalyptic number.

It is an amenable number.

5263251661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5263251661 is an equidigital number, since it uses as much as digits as its factorization.

5263251661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64800, while the sum is 37.

The square root of 5263251661 is about 72548.2712474942. The cubic root of 5263251661 is about 1739.4744152878.

The spelling of 5263251661 in words is "five billion, two hundred sixty-three million, two hundred fifty-one thousand, six hundred sixty-one".