665168251242 has 32 divisors (see below), whose sum is σ = 1451992449024. Its totient is φ = 201466655600.

The previous prime is 665168251183. The next prime is 665168251243. The reversal of 665168251242 is 242152861566.

It is a junction number, because it is equal to n+sod(n) for n = 665168251191 and 665168251200.

It is not an unprimeable number, because it can be changed into a prime (665168251243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2352234 + ... + 2619797.

It is an arithmetic number, because the mean of its divisors is an integer number (45374764032).

Almost surely, 2^665168251242 is an apocalyptic number.

665168251242 is an abundant number, since it is smaller than the sum of its proper divisors (786824197782).

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

665168251242 is a wasteful number, since it uses less digits than its factorization.

665168251242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4974074.

The product of its digits is 1382400, while the sum is 48.

The spelling of 665168251242 in words is "six hundred sixty-five billion, one hundred sixty-eight million, two hundred fifty-one thousand, two hundred forty-two".