665606325433406 has 64 divisors (see below), whose sum is σ = 1148845186621440. Its totient is φ = 283310919496800.

The previous prime is 665606325433397. The next prime is 665606325433477. The reversal of 665606325433406 is 604334523606566.

It is a happy number.

It is a super-2 number, since 2×665606325433406² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47370737081 + ... + 47370751131.

It is an arithmetic number, because the mean of its divisors is an integer number (17950706040960).

Almost surely, 2^{665606325433406} is an apocalyptic number.

665606325433406 is a deficient number, since it is larger than the sum of its proper divisors (483238861188034).

665606325433406 is a wasteful number, since it uses less digits than its factorization.

665606325433406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27309.

The product of its (nonzero) digits is 167961600, while the sum is 59.

The spelling of 665606325433406 in words is "six hundred sixty-five trillion, six hundred six billion, three hundred twenty-five million, four hundred thirty-three thousand, four hundred six".