506505623161 has 4 divisors (see below), whose sum is σ = 506507708772. Its totient is φ = 506503537552.

The previous prime is 506505623153. The next prime is 506505623231. The reversal of 506505623161 is 161326505605.

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 22479304761 + 484026318400 = 149931^2 + 695720^2 .

It is a cyclic number.

It is not a de Polignac number, because 506505623161 - 2³ = 506505623153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (506505023161) 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, 621886 + ... + 1183111.

It is an arithmetic number, because the mean of its divisors is an integer number (126626927193).

Almost surely, 2^506505623161 is an apocalyptic number.

It is an amenable number.

506505623161 is a deficient number, since it is larger than the sum of its proper divisors (2085611).

506505623161 is a wasteful number, since it uses less digits than its factorization.

506505623161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085610.

The product of its (nonzero) digits is 162000, while the sum is 40.

The spelling of 506505623161 in words is "five hundred six billion, five hundred five million, six hundred twenty-three thousand, one hundred sixty-one".