661105612 has 12 divisors (see below), whose sum is σ = 1166045440. Its totient is φ = 327949776.

The previous prime is 661105591. The next prime is 661105649. The reversal of 661105612 is 216501166.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650187 + ... + 651202.

Almost surely, 2^661105612 is an apocalyptic number.

It is an amenable number.

661105612 is a deficient number, since it is larger than the sum of its proper divisors (504939828).

661105612 is a wasteful number, since it uses less digits than its factorization.

661105612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301520 (or 1301518 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 661105612 is about 25711.9740976845. The cubic root of 661105612 is about 871.1446649611.

Adding to 661105612 its reverse (216501166), we get a palindrome (877606778).

The spelling of 661105612 in words is "six hundred sixty-one million, one hundred five thousand, six hundred twelve".