165671601 has 8 divisors (see below), whose sum is σ = 221336640. Its totient is φ = 110227152.

The previous prime is 165671591. The next prime is 165671603. The reversal of 165671601 is 106176561.

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

It is not a de Polignac number, because 165671601 - 2⁶ = 165671537 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (165671603) 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, 53386 + ... + 56403.

It is an arithmetic number, because the mean of its divisors is an integer number (27667080).

Almost surely, 2^165671601 is an apocalyptic number.

It is an amenable number.

165671601 is a deficient number, since it is larger than the sum of its proper divisors (55665039).

165671601 is a wasteful number, since it uses less digits than its factorization.

165671601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110295.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 165671601 is about 12871.3480645968. The cubic root of 165671601 is about 549.2238097963.

The spelling of 165671601 in words is "one hundred sixty-five million, six hundred seventy-one thousand, six hundred one".