665684423433441 has 32 divisors (see below), whose sum is σ = 987380491468800. Its totient is φ = 443258115987600.

The previous prime is 665684423433439. The next prime is 665684423433467. The reversal of 665684423433441 is 144334324486566.

665684423433441 is a `hidden beast` number, since 6 + 6 + 5 + 68 + 4 + 4 + 234 + 334 + 4 + 1 = 666.

It is not a de Polignac number, because 665684423433441 - 2¹ = 665684423433439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665684423433401) 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 31 ways as a sum of consecutive naturals, for example, 225597910 + ... + 228529616.

It is an arithmetic number, because the mean of its divisors is an integer number (30855640358400).

Almost surely, 2^{665684423433441} is an apocalyptic number.

It is an amenable number.

665684423433441 is a deficient number, since it is larger than the sum of its proper divisors (321696068035359).

665684423433441 is a wasteful number, since it uses less digits than its factorization.

665684423433441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2941786 (or 2941780 counting only the distinct ones).

The product of its digits is 477757440, while the sum is 63.

The spelling of 665684423433441 in words is "six hundred sixty-five trillion, six hundred eighty-four billion, four hundred twenty-three million, four hundred thirty-three thousand, four hundred forty-one".