660161721112 has 8 divisors (see below), whose sum is σ = 1237803227100. Its totient is φ = 330080860552.

The previous prime is 660161721097. The next prime is 660161721133. The reversal of 660161721112 is 211127161066.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41260107562 + ... + 41260107577.

Almost surely, 2^660161721112 is an apocalyptic number.

It is an amenable number.

660161721112 is a deficient number, since it is larger than the sum of its proper divisors (577641505988).

660161721112 is a wasteful number, since it uses less digits than its factorization.

660161721112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82520215145 (or 82520215141 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 34.

Adding to 660161721112 its reverse (211127161066), we get a palindrome (871288882178).

The spelling of 660161721112 in words is "six hundred sixty billion, one hundred sixty-one million, seven hundred twenty-one thousand, one hundred twelve".