1668201651 has 12 divisors (see below), whose sum is σ = 2409992728. Its totient is φ = 1111964544.

The previous prime is 1668201637. The next prime is 1668201673. The reversal of 1668201651 is 1561028661.

It is not a de Polignac number, because 1668201651 - 2¹⁵ = 1668168883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1668201631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 83436 + ... + 101478.

Almost surely, 2^1668201651 is an apocalyptic number.

1668201651 is a deficient number, since it is larger than the sum of its proper divisors (741791077).

1668201651 is a wasteful number, since it uses less digits than its factorization.

1668201651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28322 (or 28319 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1668201651 is about 40843.6243617042. The cubic root of 1668201651 is about 1185.9949748447.

The spelling of 1668201651 in words is "one billion, six hundred sixty-eight million, two hundred one thousand, six hundred fifty-one".