661166112 has 24 divisors (see below), whose sum is σ = 1735561296. Its totient is φ = 220388672.

The previous prime is 661166101. The next prime is 661166141. The reversal of 661166112 is 211661166.

It is a tau number, because it is divible by the number of its divisors (24).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 661166112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3443478 + ... + 3443669.

It is an arithmetic number, because the mean of its divisors is an integer number (72315054).

Almost surely, 2^661166112 is an apocalyptic number.

It is an amenable number.

661166112 is an abundant number, since it is smaller than the sum of its proper divisors (1074395184).

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

661166112 is a wasteful number, since it uses less digits than its factorization.

661166112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6887160 (or 6887152 counting only the distinct ones).

The product of its digits is 2592, while the sum is 30.

The square root of 661166112 is about 25713.1505654208. The cubic root of 661166112 is about 871.1712379441.

The spelling of 661166112 in words is "six hundred sixty-one million, one hundred sixty-six thousand, one hundred twelve".