661105112 has 32 divisors (see below), whose sum is σ = 1357754400. Its totient is φ = 300378624.

The previous prime is 661105079. The next prime is 661105121. The reversal of 661105112 is 211501166.

It is a super-2 number, since 2×661105112² = 874119938225065088, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 79868 + ... + 87755.

It is an arithmetic number, because the mean of its divisors is an integer number (42429825).

Almost surely, 2^661105112 is an apocalyptic number.

It is an amenable number.

661105112 is an abundant number, since it is smaller than the sum of its proper divisors (696649288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661105112 is a wasteful number, since it uses less digits than its factorization.

661105112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167675 (or 167671 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 661105112 is about 25711.9643745864. The cubic root of 661105112 is about 871.1444453429.

Adding to 661105112 its reverse (211501166), we get a palindrome (872606278).

The spelling of 661105112 in words is "six hundred sixty-one million, one hundred five thousand, one hundred twelve".