1668160281 has 16 divisors (see below), whose sum is σ = 2305692864. Its totient is φ = 1071929664.

The previous prime is 1668160279. The next prime is 1668160327. The reversal of 1668160281 is 1820618661.

It is not a de Polignac number, because 1668160281 - 2¹ = 1668160279 is a prime.

It is a super-4 number, since 4×1668160281⁴ (a number of 38 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1668160201) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58350 + ... + 82103.

It is an arithmetic number, because the mean of its divisors is an integer number (144105804).

Almost surely, 2^1668160281 is an apocalyptic number.

It is an amenable number.

1668160281 is a deficient number, since it is larger than the sum of its proper divisors (637532583).

1668160281 is a wasteful number, since it uses less digits than its factorization.

1668160281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140600.

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

The square root of 1668160281 is about 40843.1179147724. The cubic root of 1668160281 is about 1185.9851708706.

The spelling of 1668160281 in words is "one billion, six hundred sixty-eight million, one hundred sixty thousand, two hundred eighty-one".