1665667712 has 32 divisors (see below), whose sum is σ = 3340336800. Its totient is φ = 827308800.

The previous prime is 1665667697. The next prime is 1665667721. The reversal of 1665667712 is 2177665661.

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23762 + ... + 62417.

It is an arithmetic number, because the mean of its divisors is an integer number (104385525).

Almost surely, 2^1665667712 is an apocalyptic number.

It is an amenable number.

1665667712 is an abundant number, since it is smaller than the sum of its proper divisors (1674669088).

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

1665667712 is an equidigital number, since it uses as much as digits as its factorization.

1665667712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86344 (or 86332 counting only the distinct ones).

The product of its digits is 635040, while the sum is 47.

The square root of 1665667712 is about 40812.5925665106. The cubic root of 1665667712 is about 1185.3941758104.

The spelling of 1665667712 in words is "one billion, six hundred sixty-five million, six hundred sixty-seven thousand, seven hundred twelve".