1665899828 has 12 divisors (see below), whose sum is σ = 2915647812. Its totient is φ = 832857600.

The previous prime is 1665899827. The next prime is 1665899857. The reversal of 1665899828 is 8289985661.

It can be written as a sum of positive squares in 2 ways, for example, as 1320014224 + 345885604 = 36332^2 + 18598^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1665899827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32276 + ... + 66132.

It is an arithmetic number, because the mean of its divisors is an integer number (242970651).

Almost surely, 2^1665899828 is an apocalyptic number.

It is an amenable number.

1665899828 is a deficient number, since it is larger than the sum of its proper divisors (1249747984).

1665899828 is a wasteful number, since it uses less digits than its factorization.

1665899828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46162 (or 46160 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 62.

The square root of 1665899828 is about 40815.4361485946. The cubic root of 1665899828 is about 1185.4492360469.

The spelling of 1665899828 in words is "one billion, six hundred sixty-five million, eight hundred ninety-nine thousand, eight hundred twenty-eight".