661116172060 has 48 divisors (see below), whose sum is σ = 1407210255360. Its totient is φ = 260859044160.

The previous prime is 661116172033. The next prime is 661116172063. The reversal of 661116172060 is 60271611166.

It is a super-3 number, since 3×661116172060³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661116172063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1532017 + ... + 1915543.

It is an arithmetic number, because the mean of its divisors is an integer number (29316880320).

Almost surely, 2^661116172060 is an apocalyptic number.

It is an amenable number.

661116172060 is an abundant number, since it is smaller than the sum of its proper divisors (746094083300).

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

661116172060 is a wasteful number, since it uses less digits than its factorization.

661116172060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384706 (or 384704 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 37.

The spelling of 661116172060 in words is "six hundred sixty-one billion, one hundred sixteen million, one hundred seventy-two thousand, sixty".