165580157 has 2 divisors, whose sum is σ = 165580158.
Its totient is φ = 165580156.
The previous prime is 165580147. The next prime is 165580159. The reversal of 165580157 is 751085561.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 141824281 + 23755876 = 11909^2 + 4874^2
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-165580157 is a prime.
Together with 165580159, it forms a pair of twin primes.
It is a Chen prime.
It is a self number, because there is not a number n which added to its sum of digits gives 165580157.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (165580159) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82790078 + 82790079.
It is an arithmetic number, because the mean of its divisors is an integer number (82790079).
Almost surely, 2165580157 is an apocalyptic number.
It is an amenable number.
165580157 is a deficient number, since it is larger than the sum of its proper divisors (1).
165580157 is an equidigital number, since it uses as much as digits as its factorization.
165580157 is an evil number, because the sum of its binary digits is even.
The product of its (nonzero) digits is 42000, while the sum is 38.
The square root of 165580157 is about 12867.7953434145.
The cubic root of 165580157 is about 549.1227414478.
The spelling of 165580157 in words is "one hundred sixty-five million, five hundred eighty thousand, one hundred fifty-seven".