661169712 has 80 divisors (see below), whose sum is σ = 2066867712. Its totient is φ = 177792000.

The previous prime is 661169689. The next prime is 661169713. The reversal of 661169712 is 217961166.

It is not an unprimeable number, because it can be changed into a prime (661169713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52164 + ... + 63587.

Almost surely, 2^661169712 is an apocalyptic number.

It is an amenable number.

661169712 is an abundant number, since it is smaller than the sum of its proper divisors (1405698000).

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

661169712 is a wasteful number, since it uses less digits than its factorization.

661169712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115786 (or 115780 counting only the distinct ones).

The product of its digits is 27216, while the sum is 39.

The square root of 661169712 is about 25713.2205684158. The cubic root of 661169712 is about 871.1728190953.

The spelling of 661169712 in words is "six hundred sixty-one million, one hundred sixty-nine thousand, seven hundred twelve".