553443661 has 2 divisors, whose sum is σ = 553443662. Its totient is φ = 553443660.

The previous prime is 553443629. The next prime is 553443677. The reversal of 553443661 is 166344355.

553443661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 427869225 + 125574436 = 20685^2 + 11206^2 .

It is a cyclic number.

It is not a de Polignac number, because 553443661 - 2⁵ = 553443629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 553443661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (553443601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276721830 + 276721831.

It is an arithmetic number, because the mean of its divisors is an integer number (276721831).

Almost surely, 2^553443661 is an apocalyptic number.

It is an amenable number.

553443661 is a deficient number, since it is larger than the sum of its proper divisors (1).

553443661 is an equidigital number, since it uses as much as digits as its factorization.

553443661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 37.

The square root of 553443661 is about 23525.3833337525. The cubic root of 553443661 is about 821.0276927324.

The spelling of 553443661 in words is "five hundred fifty-three million, four hundred forty-three thousand, six hundred sixty-one".