661343032304111 has 8 divisors (see below), whose sum is σ = 670442132663424. Its totient is φ = 652245002398080.

The previous prime is 661343032304047. The next prime is 661343032304167. The reversal of 661343032304111 is 111403230343166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 661343032304111 - 2⁶ = 661343032304047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661343032304011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266369150 + ... + 268840491.

It is an arithmetic number, because the mean of its divisors is an integer number (83805266582928).

Almost surely, 2^{661343032304111} is an apocalyptic number.

661343032304111 is a deficient number, since it is larger than the sum of its proper divisors (9099100359313).

661343032304111 is a wasteful number, since it uses less digits than its factorization.

661343032304111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 535226641.

The product of its (nonzero) digits is 93312, while the sum is 38.

Adding to 661343032304111 its reverse (111403230343166), we get a palindrome (772746262647277).

The spelling of 661343032304111 in words is "six hundred sixty-one trillion, three hundred forty-three billion, thirty-two million, three hundred four thousand, one hundred eleven".