542563661 has 2 divisors, whose sum is σ = 542563662. Its totient is φ = 542563660.

The previous prime is 542563633. The next prime is 542563673. The reversal of 542563661 is 166365245.

It is a happy number.

542563661 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., 408444100 + 134119561 = 20210^2 + 11581^2 .

It is a cyclic number.

It is not a de Polignac number, because 542563661 - 2¹⁸ = 542301517 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 (542563631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 271281830 + 271281831.

It is an arithmetic number, because the mean of its divisors is an integer number (271281831).

Almost surely, 2^542563661 is an apocalyptic number.

It is an amenable number.

542563661 is a deficient number, since it is larger than the sum of its proper divisors (1).

542563661 is an equidigital number, since it uses as much as digits as its factorization.

542563661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129600, while the sum is 38.

The square root of 542563661 is about 23292.9959644525. The cubic root of 542563661 is about 815.6119262957.

The spelling of 542563661 in words is "five hundred forty-two million, five hundred sixty-three thousand, six hundred sixty-one".