553660621 has 2 divisors, whose sum is σ = 553660622. Its totient is φ = 553660620.

The previous prime is 553660603. The next prime is 553660697. The reversal of 553660621 is 126066355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 492351721 + 61308900 = 22189^2 + 7830^2 .

It is a cyclic number.

It is not a de Polignac number, because 553660621 - 2¹⁷ = 553529549 is a prime.

It is a super-2 number, since 2×553660621² = 613080166492211282, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (553660321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276830310 + 276830311.

It is an arithmetic number, because the mean of its divisors is an integer number (276830311).

Almost surely, 2^553660621 is an apocalyptic number.

It is an amenable number.

553660621 is a deficient number, since it is larger than the sum of its proper divisors (1).

553660621 is an equidigital number, since it uses as much as digits as its factorization.

553660621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 553660621 is about 23529.9940713975. The cubic root of 553660621 is about 821.1349646549.

The spelling of 553660621 in words is "five hundred fifty-three million, six hundred sixty thousand, six hundred twenty-one".