655243663 has 4 divisors (see below), whose sum is σ = 655844248. Its totient is φ = 654643080.

The previous prime is 655243649. The next prime is 655243679. The reversal of 655243663 is 366342556.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-655243663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655241663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298653 + ... + 300838.

It is an arithmetic number, because the mean of its divisors is an integer number (163961062).

Almost surely, 2^655243663 is an apocalyptic number.

655243663 is a deficient number, since it is larger than the sum of its proper divisors (600585).

655243663 is a wasteful number, since it uses less digits than its factorization.

655243663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600584.

The product of its digits is 388800, while the sum is 40.

The square root of 655243663 is about 25597.7276921214. The cubic root of 655243663 is about 868.5622366121.

The spelling of 655243663 in words is "six hundred fifty-five million, two hundred forty-three thousand, six hundred sixty-three".