53665613 has 2 divisors, whose sum is σ = 53665614. Its totient is φ = 53665612.

The previous prime is 53665607. The next prime is 53665637. The reversal of 53665613 is 31656635.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37002889 + 16662724 = 6083^2 + 4082^2 .

It is a cyclic number.

It is not a de Polignac number, because 53665613 - 2¹⁶ = 53600077 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (53665603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26832806 + 26832807.

It is an arithmetic number, because the mean of its divisors is an integer number (26832807).

Almost surely, 2^53665613 is an apocalyptic number.

It is an amenable number.

53665613 is a deficient number, since it is larger than the sum of its proper divisors (1).

53665613 is an equidigital number, since it uses as much as digits as its factorization.

53665613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48600, while the sum is 35.

The square root of 53665613 is about 7325.6817430189. The cubic root of 53665613 is about 377.1945115624.

The spelling of 53665613 in words is "fifty-three million, six hundred sixty-five thousand, six hundred thirteen".