1665500216 has 16 divisors (see below), whose sum is σ = 3123429000. Its totient is φ = 832585824.

The previous prime is 1665500171. The next prime is 1665500257. The reversal of 1665500216 is 6120055661.

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, 29810 + ... + 64958.

Almost surely, 2^1665500216 is an apocalyptic number.

It is an amenable number.

1665500216 is a deficient number, since it is larger than the sum of its proper divisors (1457928784).

1665500216 is a wasteful number, since it uses less digits than its factorization.

1665500216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41078 (or 41074 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1665500216 is about 40810.5405011990. The cubic root of 1665500216 is about 1185.3544409067.

Adding to 1665500216 its reverse (6120055661), we get a palindrome (7785555877).

The spelling of 1665500216 in words is "one billion, six hundred sixty-five million, five hundred thousand, two hundred sixteen".