165642663 has 8 divisors (see below), whose sum is σ = 220923648. Its totient is φ = 110395064.

The previous prime is 165642647. The next prime is 165642667. The reversal of 165642663 is 366246561.

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 165642663 - 2⁴ = 165642647 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165642667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7570 + ... + 19712.

It is an arithmetic number, because the mean of its divisors is an integer number (27615456).

Almost surely, 2^165642663 is an apocalyptic number.

165642663 is a deficient number, since it is larger than the sum of its proper divisors (55280985).

165642663 is a wasteful number, since it uses less digits than its factorization.

165642663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16693.

The product of its digits is 155520, while the sum is 39.

The square root of 165642663 is about 12870.2238908265. The cubic root of 165642663 is about 549.1918301369.

The spelling of 165642663 in words is "one hundred sixty-five million, six hundred forty-two thousand, six hundred sixty-three".