165723642 has 48 divisors (see below), whose sum is σ = 411428160. Its totient is φ = 47226816.

The previous prime is 165723631. The next prime is 165723659. The reversal of 165723642 is 246327561.

165723642 is a `hidden beast` number, since 1 + 6 + 5 + 7 + 2 + 3 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 165723597 and 165723606.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 54334 + ... + 57302.

It is an arithmetic number, because the mean of its divisors is an integer number (8571420).

Almost surely, 2^165723642 is an apocalyptic number.

165723642 is an abundant number, since it is smaller than the sum of its proper divisors (245704518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

165723642 is a wasteful number, since it uses less digits than its factorization.

165723642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3427 (or 3424 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 165723642 is about 12873.3694889877. The cubic root of 165723642 is about 549.2813114318.

The spelling of 165723642 in words is "one hundred sixty-five million, seven hundred twenty-three thousand, six hundred forty-two".