505156663 has 4 divisors (see below), whose sum is σ = 551080008. Its totient is φ = 459233320.

The previous prime is 505156657. The next prime is 505156679. The reversal of 505156663 is 366651505.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 505156663 - 2⁹ = 505156151 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 (505156063) 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, 22961656 + ... + 22961677.

It is an arithmetic number, because the mean of its divisors is an integer number (137770002).

Almost surely, 2^505156663 is an apocalyptic number.

505156663 is a deficient number, since it is larger than the sum of its proper divisors (45923345).

505156663 is a wasteful number, since it uses less digits than its factorization.

505156663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45923344.

The product of its (nonzero) digits is 81000, while the sum is 37.

The square root of 505156663 is about 22475.6904899494. The cubic root of 505156663 is about 796.4197632623.

The spelling of 505156663 in words is "five hundred five million, one hundred fifty-six thousand, six hundred sixty-three".