165311523073 has 4 divisors (see below), whose sum is σ = 168430608468. Its totient is φ = 162192437680.

The previous prime is 165311523071. The next prime is 165311523079. The reversal of 165311523073 is 370325113561.

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 81531378369 + 83780144704 = 285537^2 + 289448^2 .

It is a cyclic number.

It is not a de Polignac number, because 165311523073 - 2¹ = 165311523071 is a prime.

It is a super-2 number, since 2×165311523073² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165311523071) 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, 1559542618 + ... + 1559542723.

It is an arithmetic number, because the mean of its divisors is an integer number (42107652117).

Almost surely, 2^165311523073 is an apocalyptic number.

It is an amenable number.

165311523073 is a deficient number, since it is larger than the sum of its proper divisors (3119085395).

165311523073 is an equidigital number, since it uses as much as digits as its factorization.

165311523073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119085394.

The product of its (nonzero) digits is 56700, while the sum is 37.

The spelling of 165311523073 in words is "one hundred sixty-five billion, three hundred eleven million, five hundred twenty-three thousand, seventy-three".