1665896398 has 8 divisors (see below), whose sum is σ = 2520958608. Its totient is φ = 825576864.

The previous prime is 1665896381. The next prime is 1665896423. The reversal of 1665896398 is 8936985661.

It is a sphenic number, since it is the product of 3 distinct primes.

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, 3685386 + ... + 3685837.

It is an arithmetic number, because the mean of its divisors is an integer number (315119826).

Almost surely, 2^1665896398 is an apocalyptic number.

1665896398 is a deficient number, since it is larger than the sum of its proper divisors (855062210).

1665896398 is a wasteful number, since it uses less digits than its factorization.

1665896398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7371338.

The product of its digits is 16796160, while the sum is 61.

The square root of 1665896398 is about 40815.3941301563. The cubic root of 1665896398 is about 1185.4484224539.

The spelling of 1665896398 in words is "one billion, six hundred sixty-five million, eight hundred ninety-six thousand, three hundred ninety-eight".