661664112 has 40 divisors (see below), whose sum is σ = 1716140160. Its totient is φ = 219672000.

The previous prime is 661664071. The next prime is 661664119. The reversal of 661664112 is 211466166.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661664119) 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 7 ways as a sum of consecutive naturals, for example, 15412 + ... + 39507.

It is an arithmetic number, because the mean of its divisors is an integer number (42903504).

Almost surely, 2^661664112 is an apocalyptic number.

It is an amenable number.

661664112 is an abundant number, since it is smaller than the sum of its proper divisors (1054476048).

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

661664112 is a wasteful number, since it uses less digits than its factorization.

661664112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55181 (or 55175 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 661664112 is about 25722.8325034394. The cubic root of 661664112 is about 871.3899093634.

The spelling of 661664112 in words is "six hundred sixty-one million, six hundred sixty-four thousand, one hundred twelve".