661108312 has 16 divisors (see below), whose sum is σ = 1241145360. Its totient is φ = 330136224.

The previous prime is 661108309. The next prime is 661108319. The reversal of 661108312 is 213801166.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661108319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45468 + ... + 58219.

It is an arithmetic number, because the mean of its divisors is an integer number (77571585).

Almost surely, 2^661108312 is an apocalyptic number.

It is an amenable number.

661108312 is a deficient number, since it is larger than the sum of its proper divisors (580037048).

661108312 is a wasteful number, since it uses less digits than its factorization.

661108312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104490 (or 104486 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 661108312 is about 25712.0266023509. The cubic root of 661108312 is about 871.1458508974.

Adding to 661108312 its reverse (213801166), we get a palindrome (874909478).

The spelling of 661108312 in words is "six hundred sixty-one million, one hundred eight thousand, three hundred twelve".