1668681201 has 16 divisors (see below), whose sum is σ = 2441714688. Its totient is φ = 1005262800.

The previous prime is 1668681191. The next prime is 1668681229. The reversal of 1668681201 is 1021868661.

It is not a de Polignac number, because 1668681201 - 2¹⁹ = 1668156913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1668681201.

It is not an unprimeable number, because it can be changed into a prime (1668681401) 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 15 ways as a sum of consecutive naturals, for example, 145885 + ... + 156906.

It is an arithmetic number, because the mean of its divisors is an integer number (152607168).

Almost surely, 2^1668681201 is an apocalyptic number.

1668681201 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1668681201 is a deficient number, since it is larger than the sum of its proper divisors (773033487).

1668681201 is a wasteful number, since it uses less digits than its factorization.

1668681201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302972.

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 1668681201 is about 40849.4945011563. The cubic root of 1668681201 is about 1186.1086080698.

The spelling of 1668681201 in words is "one billion, six hundred sixty-eight million, six hundred eighty-one thousand, two hundred one".