661433303334165 has 32 divisors (see below), whose sum is σ = 1065285211044096. Its totient is φ = 350437137592320.

The previous prime is 661433303334151. The next prime is 661433303334227. The reversal of 661433303334165 is 561433303334166.

661433303334165 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 661433303334165 - 2⁶ = 661433303334101 is a prime.

It is a Curzon number.

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, 101561521 + ... + 107877750.

It is an arithmetic number, because the mean of its divisors is an integer number (33290162845128).

Almost surely, 2^{661433303334165} is an apocalyptic number.

It is an amenable number.

661433303334165 is a deficient number, since it is larger than the sum of its proper divisors (403851907709931).

661433303334165 is a wasteful number, since it uses less digits than its factorization.

661433303334165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209440669.

The product of its (nonzero) digits is 12597120, while the sum is 51.

Subtracting from 661433303334165 its reverse (561433303334166), we obtain a palindrome (99999999999999).

The spelling of 661433303334165 in words is "six hundred sixty-one trillion, four hundred thirty-three billion, three hundred three million, three hundred thirty-four thousand, one hundred sixty-five".