665748768144042 has 96 divisors (see below), whose sum is σ = 1578054499781760. Its totient is φ = 201169592357760.

The previous prime is 665748768144017. The next prime is 665748768144049. The reversal of 665748768144042 is 240441867847566.

665748768144042 is a `hidden beast` number, since 6 + 6 + 5 + 7 + 4 + 87 + 68 + 1 + 440 + 42 = 666.

It is not an unprimeable number, because it can be changed into a prime (665748768144049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 471739459 + ... + 473148617.

It is an arithmetic number, because the mean of its divisors is an integer number (16438067706060).

Almost surely, 2^{665748768144042} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665748768144042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (789027249890880).

665748768144042 is an abundant number, since it is smaller than the sum of its proper divisors (912305731637718).

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

665748768144042 is a wasteful number, since it uses less digits than its factorization.

665748768144042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415948 (or 1415945 counting only the distinct ones).

The product of its (nonzero) digits is 1734082560, while the sum is 72.

The spelling of 665748768144042 in words is "six hundred sixty-five trillion, seven hundred forty-eight billion, seven hundred sixty-eight million, one hundred forty-four thousand, forty-two".