1668826836 has 36 divisors (see below), whose sum is σ = 4332438292. Its totient is φ = 541240704.

The previous prime is 1668826781. The next prime is 1668826849. The reversal of 1668826836 is 6386288661.

It can be written as a sum of positive squares in 2 ways, for example, as 1582448400 + 86378436 = 39780^2 + 9294^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

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, 625105 + ... + 627768.

Almost surely, 2^1668826836 is an apocalyptic number.

It is an amenable number.

1668826836 is an abundant number, since it is smaller than the sum of its proper divisors (2663611456).

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

1668826836 is a wasteful number, since it uses less digits than its factorization.

1668826836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1252920 (or 1252915 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The square root of 1668826836 is about 40851.2770424622. The cubic root of 1668826836 is about 1186.1431131432.

The spelling of 1668826836 in words is "one billion, six hundred sixty-eight million, eight hundred twenty-six thousand, eight hundred thirty-six".