665851316 has 24 divisors (see below), whose sum is σ = 1285484424. Its totient is φ = 299819520.

The previous prime is 665851313. The next prime is 665851321. The reversal of 665851316 is 613158566.

It can be written as a sum of positive squares in 4 ways, for example, as 4900 + 665846416 = 70^2 + 25804^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665851313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154025 + ... + 158288.

It is an arithmetic number, because the mean of its divisors is an integer number (53561851).

Almost surely, 2^665851316 is an apocalyptic number.

It is an amenable number.

665851316 is a deficient number, since it is larger than the sum of its proper divisors (619633108).

665851316 is a wasteful number, since it uses less digits than its factorization.

665851316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312371 (or 312369 counting only the distinct ones).

The product of its digits is 129600, while the sum is 41.

The square root of 665851316 is about 25804.0949463452. The cubic root of 665851316 is about 873.2241822421.

The spelling of 665851316 in words is "six hundred sixty-five million, eight hundred fifty-one thousand, three hundred sixteen".