165722601 has 16 divisors (see below), whose sum is σ = 241391808. Its totient is φ = 100296000.

The previous prime is 165722597. The next prime is 165722603. The reversal of 165722601 is 106227561.

It is not a de Polignac number, because 165722601 - 2² = 165722597 is a prime.

It is not an unprimeable number, because it can be changed into a prime (165722603) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23151 + ... + 29451.

It is an arithmetic number, because the mean of its divisors is an integer number (15086988).

Almost surely, 2^165722601 is an apocalyptic number.

165722601 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

165722601 is a deficient number, since it is larger than the sum of its proper divisors (75669207).

165722601 is a wasteful number, since it uses less digits than its factorization.

165722601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7112.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 165722601 is about 12873.3290566193. The cubic root of 165722601 is about 549.2801613182.

Subtracting from 165722601 its product of nonzero digits (5040), we obtain a palindrome (165717561).

The spelling of 165722601 in words is "one hundred sixty-five million, seven hundred twenty-two thousand, six hundred one".