165415951 has 2 divisors, whose sum is σ = 165415952. Its totient is φ = 165415950.

The previous prime is 165415949. The next prime is 165415973. The reversal of 165415951 is 159514561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 165415951 - 2¹ = 165415949 is a prime.

Together with 165415949, 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 165415951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165415981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82707975 + 82707976.

It is an arithmetic number, because the mean of its divisors is an integer number (82707976).

Almost surely, 2^165415951 is an apocalyptic number.

165415951 is a deficient number, since it is larger than the sum of its proper divisors (1).

165415951 is an equidigital number, since it uses as much as digits as its factorization.

165415951 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27000, while the sum is 37.

The square root of 165415951 is about 12861.4132582699. The cubic root of 165415951 is about 548.9411595604.

The spelling of 165415951 in words is "one hundred sixty-five million, four hundred fifteen thousand, nine hundred fifty-one".