505660061 has 4 divisors (see below), whose sum is σ = 507016092. Its totient is φ = 504304032.

The previous prime is 505660027. The next prime is 505660069. The reversal of 505660061 is 160066505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 160066505 = 5 ⋅32013301.

It can be written as a sum of positive squares in 2 ways, for example, as 393427225 + 112232836 = 19835^2 + 10594^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505660061 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 (505660069) 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, 677456 + ... + 678201.

It is an arithmetic number, because the mean of its divisors is an integer number (126754023).

Almost surely, 2^505660061 is an apocalyptic number.

It is an amenable number.

505660061 is a deficient number, since it is larger than the sum of its proper divisors (1356031).

505660061 is a wasteful number, since it uses less digits than its factorization.

505660061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1356030.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 505660061 is about 22486.8864229799. The cubic root of 505660061 is about 796.6842244652.

The spelling of 505660061 in words is "five hundred five million, six hundred sixty thousand, sixty-one".