165687645 has 8 divisors (see below), whose sum is σ = 265100256. Its totient is φ = 88366736.

The previous prime is 165687637. The next prime is 165687647. The reversal of 165687645 is 546786561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 165687645 - 2³ = 165687637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 165687594 and 165687603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165687647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5522907 + ... + 5522936.

It is an arithmetic number, because the mean of its divisors is an integer number (33137532).

Almost surely, 2^165687645 is an apocalyptic number.

165687645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

165687645 is a deficient number, since it is larger than the sum of its proper divisors (99412611).

165687645 is a wasteful number, since it uses less digits than its factorization.

165687645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11045851.

The product of its digits is 1209600, while the sum is 48.

The square root of 165687645 is about 12871.9712942502. The cubic root of 165687645 is about 549.2415385687.

The spelling of 165687645 in words is "one hundred sixty-five million, six hundred eighty-seven thousand, six hundred forty-five".