1668192972 has 12 divisors (see below), whose sum is σ = 3892450296. Its totient is φ = 556064320.

The previous prime is 1668192971. The next prime is 1668192997. The reversal of 1668192972 is 2792918661.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1668192971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69508029 + ... + 69508052.

It is an arithmetic number, because the mean of its divisors is an integer number (324370858).

Almost surely, 2^1668192972 is an apocalyptic number.

1668192972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1668192972 is an abundant number, since it is smaller than the sum of its proper divisors (2224257324).

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

1668192972 is a wasteful number, since it uses less digits than its factorization.

1668192972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139016088 (or 139016086 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The square root of 1668192972 is about 40843.5181148735. The cubic root of 1668192972 is about 1185.9929180854.

The spelling of 1668192972 in words is "one billion, six hundred sixty-eight million, one hundred ninety-two thousand, nine hundred seventy-two".