5655257521 has 2 divisors, whose sum is σ = 5655257522. Its totient is φ = 5655257520.

The previous prime is 5655257483. The next prime is 5655257533. The reversal of 5655257521 is 1257525565.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3926776896 + 1728480625 = 62664^2 + 41575^2 .

It is a cyclic number.

It is not a de Polignac number, because 5655257521 - 2⁷ = 5655257393 is a prime.

It is not a weakly prime, because it can be changed into another prime (5655257021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2827628760 + 2827628761.

It is an arithmetic number, because the mean of its divisors is an integer number (2827628761).

Almost surely, 2^5655257521 is an apocalyptic number.

It is an amenable number.

5655257521 is a deficient number, since it is larger than the sum of its proper divisors (1).

5655257521 is an equidigital number, since it uses as much as digits as its factorization.

5655257521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 525000, while the sum is 43.

The square root of 5655257521 is about 75201.4462693371. The cubic root of 5655257521 is about 1781.6297745182.

The spelling of 5655257521 in words is "five billion, six hundred fifty-five million, two hundred fifty-seven thousand, five hundred twenty-one".