663576541 has 2 divisors, whose sum is σ = 663576542. Its totient is φ = 663576540.

The previous prime is 663576527. The next prime is 663576629. The reversal of 663576541 is 145675366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 663268516 + 308025 = 25754^2 + 555^2 .

It is a cyclic number.

It is not a de Polignac number, because 663576541 - 2⁹ = 663576029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663576941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331788270 + 331788271.

It is an arithmetic number, because the mean of its divisors is an integer number (331788271).

Almost surely, 2^663576541 is an apocalyptic number.

It is an amenable number.

663576541 is a deficient number, since it is larger than the sum of its proper divisors (1).

663576541 is an equidigital number, since it uses as much as digits as its factorization.

663576541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 453600, while the sum is 43.

The square root of 663576541 is about 25759.9794448676. The cubic root of 663576541 is about 872.2286372134.

The spelling of 663576541 in words is "six hundred sixty-three million, five hundred seventy-six thousand, five hundred forty-one".