165613871 has 2 divisors, whose sum is σ = 165613872. Its totient is φ = 165613870.

The previous prime is 165613793. The next prime is 165613901. The reversal of 165613871 is 178316561.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-165613871 is a prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82806935 + 82806936.

It is an arithmetic number, because the mean of its divisors is an integer number (82806936).

Almost surely, 2^165613871 is an apocalyptic number.

165613871 is a deficient number, since it is larger than the sum of its proper divisors (1).

165613871 is an equidigital number, since it uses as much as digits as its factorization.

165613871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 38.

The square root of 165613871 is about 12869.1052913557. The cubic root of 165613871 is about 549.1600081270.

The spelling of 165613871 in words is "one hundred sixty-five million, six hundred thirteen thousand, eight hundred seventy-one".