505706665 has 8 divisors (see below), whose sum is σ = 607036680. Its totient is φ = 404439552.

The previous prime is 505706651. The next prime is 505706693. The reversal of 505706665 is 566607505.

It can be written as a sum of positive squares in 4 ways, for example, as 7033104 + 498673561 = 2652^2 + 22331^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505706665 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4281 + ... + 32089.

It is an arithmetic number, because the mean of its divisors is an integer number (75879585).

Almost surely, 2^505706665 is an apocalyptic number.

It is an amenable number.

505706665 is a deficient number, since it is larger than the sum of its proper divisors (101330015).

505706665 is a wasteful number, since it uses less digits than its factorization.

505706665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31451.

The product of its (nonzero) digits is 189000, while the sum is 40.

The square root of 505706665 is about 22487.9226475013. The cubic root of 505706665 is about 796.7086990967.

The spelling of 505706665 in words is "five hundred five million, seven hundred six thousand, six hundred sixty-five".