665133642 has 24 divisors (see below), whose sum is σ = 1503781344. Its totient is φ = 212071464.

The previous prime is 665133631. The next prime is 665133643. The reversal of 665133642 is 246331566.

665133642 is a `hidden beast` number, since 6 + 6 + 5 + 1 + 3 + 3 + 642 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 665133597 and 665133606.

It is not an unprimeable number, because it can be changed into a prime (665133643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 802888 + ... + 803715.

It is an arithmetic number, because the mean of its divisors is an integer number (62657556).

Almost surely, 2^665133642 is an apocalyptic number.

665133642 is an abundant number, since it is smaller than the sum of its proper divisors (838647702).

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

665133642 is a wasteful number, since it uses less digits than its factorization.

665133642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1606634 (or 1606631 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 665133642 is about 25790.1849935203. The cubic root of 665133642 is about 872.9103406147.

The spelling of 665133642 in words is "six hundred sixty-five million, one hundred thirty-three thousand, six hundred forty-two".