165520562005 has 4 divisors (see below), whose sum is σ = 198624674412. Its totient is φ = 132416449600.

The previous prime is 165520562003. The next prime is 165520562017. The reversal of 165520562005 is 500265025561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 500265025561 = 7 ⋅71466432223.

It can be written as a sum of positive squares in 2 ways, for example, as 64563760836 + 100956801169 = 254094^2 + 317737^2 .

It is not a de Polignac number, because 165520562005 - 2¹ = 165520562003 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 (165520562003) 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, 16552056196 + ... + 16552056205.

It is an arithmetic number, because the mean of its divisors is an integer number (49656168603).

Almost surely, 2^165520562005 is an apocalyptic number.

It is an amenable number.

165520562005 is a deficient number, since it is larger than the sum of its proper divisors (33104112407).

165520562005 is an equidigital number, since it uses as much as digits as its factorization.

165520562005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33104112406.

The product of its (nonzero) digits is 90000, while the sum is 37.

Adding to 165520562005 its reverse (500265025561), we get a palindrome (665785587566).

The spelling of 165520562005 in words is "one hundred sixty-five billion, five hundred twenty million, five hundred sixty-two thousand, five".