165863585642 has 16 divisors (see below), whose sum is σ = 250488708864. Its totient is φ = 82367550000.

The previous prime is 165863585621. The next prime is 165863585689. The reversal of 165863585642 is 246585368561.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1710767 + ... + 1805117.

It is an arithmetic number, because the mean of its divisors is an integer number (15655544304).

Almost surely, 2^165863585642 is an apocalyptic number.

165863585642 is a deficient number, since it is larger than the sum of its proper divisors (84625123222).

165863585642 is a wasteful number, since it uses less digits than its factorization.

165863585642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100325.

The product of its digits is 41472000, while the sum is 59.

The spelling of 165863585642 in words is "one hundred sixty-five billion, eight hundred sixty-three million, five hundred eighty-five thousand, six hundred forty-two".