1665143838 has 32 divisors (see below), whose sum is σ = 3725172000. Its totient is φ = 551320128.

The previous prime is 1665143801. The next prime is 1665143861. The reversal of 1665143838 is 8383415661.

1665143838 is a `hidden beast` number, since 166 + 51 + 438 + 3 + 8 = 666.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1665143793 and 1665143802.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 95431 + ... + 111522.

It is an arithmetic number, because the mean of its divisors is an integer number (116411625).

Almost surely, 2^1665143838 is an apocalyptic number.

1665143838 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1665143838 is an abundant number, since it is smaller than the sum of its proper divisors (2060028162).

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

1665143838 is a wasteful number, since it uses less digits than its factorization.

1665143838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207113 (or 207107 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 1665143838 is about 40806.1740181556. The cubic root of 1665143838 is about 1185.2698888555.

The spelling of 1665143838 in words is "one billion, six hundred sixty-five million, one hundred forty-three thousand, eight hundred thirty-eight".