506660405 has 4 divisors (see below), whose sum is σ = 607992492. Its totient is φ = 405328320.

The previous prime is 506660389. The next prime is 506660419. The reversal of 506660405 is 504066605.

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

It can be written as a sum of positive squares in 2 ways, for example, as 239599441 + 267060964 = 15479^2 + 16342^2 .

It is not a de Polignac number, because 506660405 - 2⁴ = 506660389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50666036 + ... + 50666045.

It is an arithmetic number, because the mean of its divisors is an integer number (151998123).

Almost surely, 2^506660405 is an apocalyptic number.

It is an amenable number.

506660405 is a deficient number, since it is larger than the sum of its proper divisors (101332087).

506660405 is a wasteful number, since it uses less digits than its factorization.

506660405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101332086.

The product of its (nonzero) digits is 21600, while the sum is 32.

The square root of 506660405 is about 22509.1182634949. The cubic root of 506660405 is about 797.2092368091.

The spelling of 506660405 in words is "five hundred six million, six hundred sixty thousand, four hundred five".