1665589842 has 24 divisors (see below), whose sum is σ = 4124318016. Its totient is φ = 475882776.

The previous prime is 1665589771. The next prime is 1665589853. The reversal of 1665589842 is 2489855661.

1665589842 is a `hidden beast` number, since 1 + 6 + 6 + 558 + 9 + 84 + 2 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6609358 + ... + 6609609.

It is an arithmetic number, because the mean of its divisors is an integer number (171846584).

Almost surely, 2^1665589842 is an apocalyptic number.

1665589842 is an abundant number, since it is smaller than the sum of its proper divisors (2458728174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1665589842 is a wasteful number, since it uses less digits than its factorization.

1665589842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13218982 (or 13218979 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The square root of 1665589842 is about 40811.6385605871. The cubic root of 1665589842 is about 1185.3757031218.

It can be divided in two parts, 166558 and 9842, that added together give a square (176400 = 420²).

The spelling of 1665589842 in words is "one billion, six hundred sixty-five million, five hundred eighty-nine thousand, eight hundred forty-two".