665216552 has 96 divisors (see below), whose sum is σ = 1704719520. Its totient is φ = 239218560.

The previous prime is 665216549. The next prime is 665216567. The reversal of 665216552 is 255612566.

It is a happy number.

It is a super-2 number, since 2×665216552² = 885026122109537408, which contains 22 as substring.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50123 + ... + 61989.

It is an arithmetic number, because the mean of its divisors is an integer number (17757495).

Almost surely, 2^665216552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665216552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (852359760).

665216552 is an abundant number, since it is smaller than the sum of its proper divisors (1039502968).

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

665216552 is a wasteful number, since it uses less digits than its factorization.

665216552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11911 (or 11900 counting only the distinct ones).

The product of its digits is 108000, while the sum is 38.

The square root of 665216552 is about 25791.7923378737. The cubic root of 665216552 is about 872.9466090100.

The spelling of 665216552 in words is "six hundred sixty-five million, two hundred sixteen thousand, five hundred fifty-two".