663563477 has 2 divisors, whose sum is σ = 663563478. Its totient is φ = 663563476.

The previous prime is 663563359. The next prime is 663563479. The reversal of 663563477 is 774365366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638623441 + 24940036 = 25271^2 + 4994^2 .

It is a cyclic number.

It is not a de Polignac number, because 663563477 - 2⁸ = 663563221 is a prime.

Together with 663563479, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663563479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331781738 + 331781739.

It is an arithmetic number, because the mean of its divisors is an integer number (331781739).

Almost surely, 2^663563477 is an apocalyptic number.

It is an amenable number.

663563477 is a deficient number, since it is larger than the sum of its proper divisors (1).

663563477 is an equidigital number, since it uses as much as digits as its factorization.

663563477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 47.

The square root of 663563477 is about 25759.7258719886. The cubic root of 663563477 is about 872.2229132469. Note that the first 3 decimals are identical.

The spelling of 663563477 in words is "six hundred sixty-three million, five hundred sixty-three thousand, four hundred seventy-seven".