165111451 has 2 divisors, whose sum is σ = 165111452. Its totient is φ = 165111450.

The previous prime is 165111431. The next prime is 165111461. The reversal of 165111451 is 154111561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165111451 is a prime.

It is not a weakly prime, because it can be changed into another prime (165111431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82555725 + 82555726.

It is an arithmetic number, because the mean of its divisors is an integer number (82555726).

Almost surely, 2^165111451 is an apocalyptic number.

165111451 is a deficient number, since it is larger than the sum of its proper divisors (1).

165111451 is an equidigital number, since it uses as much as digits as its factorization.

165111451 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 600, while the sum is 25.

The square root of 165111451 is about 12849.5700706288. The cubic root of 165111451 is about 548.6041198076.

The spelling of 165111451 in words is "one hundred sixty-five million, one hundred eleven thousand, four hundred fifty-one".