665882612 has 6 divisors (see below), whose sum is σ = 1165294578. Its totient is φ = 332941304.

The previous prime is 665882611. The next prime is 665882627. The reversal of 665882612 is 216288566.

It can be written as a sum of positive squares in only one way, i.e., 653109136 + 12773476 = 25556^2 + 3574^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665882611) by changing a digit.

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 as a sum of consecutive naturals, namely, 83235323 + ... + 83235330.

It is an arithmetic number, because the mean of its divisors is an integer number (194215763).

Almost surely, 2^665882612 is an apocalyptic number.

It is an amenable number.

665882612 is a deficient number, since it is larger than the sum of its proper divisors (499411966).

665882612 is a wasteful number, since it uses less digits than its factorization.

665882612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166470657 (or 166470655 counting only the distinct ones).

The product of its digits is 276480, while the sum is 44.

The square root of 665882612 is about 25804.7013545982. The cubic root of 665882612 is about 873.2378629719.

The spelling of 665882612 in words is "six hundred sixty-five million, eight hundred eighty-two thousand, six hundred twelve".