165012563 has 4 divisors (see below), whose sum is σ = 169472400. Its totient is φ = 160552728.

The previous prime is 165012559. The next prime is 165012569. The reversal of 165012563 is 365210561.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 165012563 - 2² = 165012559 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165012569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2229863 + ... + 2229936.

It is an arithmetic number, because the mean of its divisors is an integer number (42368100).

Almost surely, 2^165012563 is an apocalyptic number.

165012563 is a deficient number, since it is larger than the sum of its proper divisors (4459837).

165012563 is an equidigital number, since it uses as much as digits as its factorization.

165012563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4459836.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 165012563 is about 12845.7215834689. The cubic root of 165012563 is about 548.4945752182.

The spelling of 165012563 in words is "one hundred sixty-five million, twelve thousand, five hundred sixty-three".