165428061 has 4 divisors (see below), whose sum is σ = 220570752. Its totient is φ = 110285372.

The previous prime is 165427993. The next prime is 165428069. The reversal of 165428061 is 160824561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 165428061 - 2²² = 161233757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165428069) 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 in 3 ways as a sum of consecutive naturals, for example, 27571341 + ... + 27571346.

It is an arithmetic number, because the mean of its divisors is an integer number (55142688).

Almost surely, 2^165428061 is an apocalyptic number.

It is an amenable number.

165428061 is a deficient number, since it is larger than the sum of its proper divisors (55142691).

165428061 is an equidigital number, since it uses as much as digits as its factorization.

165428061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55142690.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 165428061 is about 12861.8840377295. The cubic root of 165428061 is about 548.9545551150.

The spelling of 165428061 in words is "one hundred sixty-five million, four hundred twenty-eight thousand, sixty-one".