1665108020 has 12 divisors (see below), whose sum is σ = 3496726884. Its totient is φ = 666043200.

The previous prime is 1665108019. The next prime is 1665108041. The reversal of 1665108020 is 208015661.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 748350736 + 916757284 = 27356^2 + 30278^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41627681 + ... + 41627720.

It is an arithmetic number, because the mean of its divisors is an integer number (291393907).

Almost surely, 2^1665108020 is an apocalyptic number.

1665108020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665108020 is an abundant number, since it is smaller than the sum of its proper divisors (1831618864).

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

1665108020 is a wasteful number, since it uses less digits than its factorization.

1665108020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83255410 (or 83255408 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 1665108020 is about 40805.7351361301. The cubic root of 1665108020 is about 1185.2613902300.

The spelling of 1665108020 in words is "one billion, six hundred sixty-five million, one hundred eight thousand, twenty".