655511663 has 2 divisors, whose sum is σ = 655511664. Its totient is φ = 655511662.

The previous prime is 655511657. The next prime is 655511677. The reversal of 655511663 is 366115556.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 655511663 - 2²⁰ = 654463087 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (655511683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 327755831 + 327755832.

It is an arithmetic number, because the mean of its divisors is an integer number (327755832).

Almost surely, 2^655511663 is an apocalyptic number.

655511663 is a deficient number, since it is larger than the sum of its proper divisors (1).

655511663 is an equidigital number, since it uses as much as digits as its factorization.

655511663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 38.

The square root of 655511663 is about 25602.9619966128. The cubic root of 655511663 is about 868.6806368166.

The spelling of 655511663 in words is "six hundred fifty-five million, five hundred eleven thousand, six hundred sixty-three".