665612842 has 16 divisors (see below), whose sum is σ = 1038753792. Its totient is φ = 319530960.

The previous prime is 665612833. The next prime is 665612861. The reversal of 665612842 is 248216566.

665612842 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 665612795 and 665612804.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34393 + ... + 50140.

It is an arithmetic number, because the mean of its divisors is an integer number (64922112).

Almost surely, 2^665612842 is an apocalyptic number.

665612842 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

665612842 is a deficient number, since it is larger than the sum of its proper divisors (373140950).

665612842 is a wasteful number, since it uses less digits than its factorization.

665612842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84693.

The product of its digits is 138240, while the sum is 40.

The square root of 665612842 is about 25799.4736768020. The cubic root of 665612842 is about 873.1199216641.

The spelling of 665612842 in words is "six hundred sixty-five million, six hundred twelve thousand, eight hundred forty-two".