1668137672 has 16 divisors (see below), whose sum is σ = 3133244400. Its totient is φ = 832605840.

The previous prime is 1668137671. The next prime is 1668137689. The reversal of 1668137672 is 2767318661.

It is not an unprimeable number, because it can be changed into a prime (1668137671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 178022 + ... + 187157.

It is an arithmetic number, because the mean of its divisors is an integer number (195827775).

Almost surely, 2^1668137672 is an apocalyptic number.

It is an amenable number.

1668137672 is a deficient number, since it is larger than the sum of its proper divisors (1465106728).

1668137672 is a wasteful number, since it uses less digits than its factorization.

1668137672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365756 (or 365752 counting only the distinct ones).

The product of its digits is 508032, while the sum is 47.

The square root of 1668137672 is about 40842.8411352589. The cubic root of 1668137672 is about 1185.9798128603.

The spelling of 1668137672 in words is "one billion, six hundred sixty-eight million, one hundred thirty-seven thousand, six hundred seventy-two".