665842842 has 192 divisors, whose sum is σ = 1877541120. Its totient is φ = 172440576.

The previous prime is 665842841. The next prime is 665842873. The reversal of 665842842 is 248248566.

665842842 is a `hidden beast` number, since 6 + 6 + 584 + 28 + 42 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665842841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1676988 + ... + 1677384.

It is an arithmetic number, because the mean of its divisors is an integer number (9778860).

Almost surely, 2^665842842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665842842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938770560).

665842842 is an abundant number, since it is smaller than the sum of its proper divisors (1211698278).

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

665842842 is a wasteful number, since it uses less digits than its factorization.

665842842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 455 counting only the distinct ones).

The product of its digits is 737280, while the sum is 45.

The square root of 665842842 is about 25803.9307470781. The cubic root of 665842842 is about 873.2204778449.

The spelling of 665842842 in words is "six hundred sixty-five million, eight hundred forty-two thousand, eight hundred forty-two".