165316227557 has 4 divisors (see below), whose sum is σ = 178032860460. Its totient is φ = 152599594656.

The previous prime is 165316227553. The next prime is 165316227607. The reversal of 165316227557 is 755722613561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755722613561 = 53 ⋅14258917237.

It can be written as a sum of positive squares in 2 ways, for example, as 109075630756 + 56240596801 = 330266^2 + 237151^2 .

It is a cyclic number.

It is not a de Polignac number, because 165316227557 - 2² = 165316227553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165316227553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6358316432 + ... + 6358316457.

It is an arithmetic number, because the mean of its divisors is an integer number (44508215115).

Almost surely, 2^165316227557 is an apocalyptic number.

It is an amenable number.

165316227557 is a deficient number, since it is larger than the sum of its proper divisors (12716632903).

165316227557 is a wasteful number, since it uses less digits than its factorization.

165316227557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12716632902.

The product of its digits is 2646000, while the sum is 50.

The spelling of 165316227557 in words is "one hundred sixty-five billion, three hundred sixteen million, two hundred twenty-seven thousand, five hundred fifty-seven".