165415973 has 2 divisors, whose sum is σ = 165415974. Its totient is φ = 165415972.

The previous prime is 165415951. The next prime is 165415979. The reversal of 165415973 is 379514561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 91833889 + 73582084 = 9583^2 + 8578^2 .

It is a cyclic number.

It is not a de Polignac number, because 165415973 - 2⁶ = 165415909 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 165415973.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (165415979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82707986 + 82707987.

It is an arithmetic number, because the mean of its divisors is an integer number (82707987).

Almost surely, 2^165415973 is an apocalyptic number.

It is an amenable number.

165415973 is a deficient number, since it is larger than the sum of its proper divisors (1).

165415973 is an equidigital number, since it uses as much as digits as its factorization.

165415973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 113400, while the sum is 41.

The square root of 165415973 is about 12861.4141135413. The cubic root of 165415973 is about 548.9411838964.

The spelling of 165415973 in words is "one hundred sixty-five million, four hundred fifteen thousand, nine hundred seventy-three".