1665825404 has 24 divisors (see below), whose sum is σ = 2972341008. Its totient is φ = 816608000.

The previous prime is 1665825397. The next prime is 1665825419. The reversal of 1665825404 is 4045285661.

It is a super-2 number, since 2×1665825404² = 5549948553223526432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 510779 + ... + 514029.

It is an arithmetic number, because the mean of its divisors is an integer number (123847542).

Almost surely, 2^1665825404 is an apocalyptic number.

It is an amenable number.

1665825404 is a deficient number, since it is larger than the sum of its proper divisors (1306515604).

1665825404 is a wasteful number, since it uses less digits than its factorization.

1665825404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5725 (or 5723 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 41.

The square root of 1665825404 is about 40814.5244245232. The cubic root of 1665825404 is about 1185.4315824869.

The spelling of 1665825404 in words is "one billion, six hundred sixty-five million, eight hundred twenty-five thousand, four hundred four".