1665363860 has 48 divisors (see below), whose sum is σ = 3830697360. Its totient is φ = 605337600.

The previous prime is 1665363857. The next prime is 1665363863. The reversal of 1665363860 is 683635661.

It is an interprime number because it is at equal distance from previous prime (1665363857) and next prime (1665363863).

It can be written as a sum of positive squares in 8 ways, for example, as 110796676 + 1554567184 = 10526^2 + 39428^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665363863) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74591 + ... + 94310.

It is an arithmetic number, because the mean of its divisors is an integer number (79806195).

Almost surely, 2^1665363860 is an apocalyptic number.

1665363860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1665363860 is an abundant number, since it is smaller than the sum of its proper divisors (2165333500).

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

1665363860 is a wasteful number, since it uses less digits than its factorization.

1665363860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168956 (or 168954 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The square root of 1665363860 is about 40808.8698691841. The cubic root of 1665363860 is about 1185.3220913460.

The spelling of 1665363860 in words is "one billion, six hundred sixty-five million, three hundred sixty-three thousand, eight hundred sixty".