165897663 has 8 divisors (see below), whose sum is σ = 221909376. Its totient is φ = 110242200.

The previous prime is 165897659. The next prime is 165897701. The reversal of 165897663 is 366798561.

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

It is not a de Polignac number, because 165897663 - 2² = 165897659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165897653) 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, 87973 + ... + 89838.

It is an arithmetic number, because the mean of its divisors is an integer number (27738672).

Almost surely, 2^165897663 is an apocalyptic number.

165897663 is a deficient number, since it is larger than the sum of its proper divisors (56011713).

165897663 is a wasteful number, since it uses less digits than its factorization.

165897663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178125.

The product of its digits is 1632960, while the sum is 51.

The square root of 165897663 is about 12880.1266686318. The cubic root of 165897663 is about 549.4735049817.

The spelling of 165897663 in words is "one hundred sixty-five million, eight hundred ninety-seven thousand, six hundred sixty-three".