1668417501 has 16 divisors (see below), whose sum is σ = 2278565696. Its totient is φ = 1085325696.

The previous prime is 1668417467. The next prime is 1668417601. The reversal of 1668417501 is 1057148661.

It is not a de Polignac number, because 1668417501 - 2⁹ = 1668416989 is a prime.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1668417501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668417601) 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, 135081 + ... + 146913.

It is an arithmetic number, because the mean of its divisors is an integer number (142410356).

Almost surely, 2^1668417501 is an apocalyptic number.

It is an amenable number.

1668417501 is a deficient number, since it is larger than the sum of its proper divisors (610148195).

1668417501 is a wasteful number, since it uses less digits than its factorization.

1668417501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12972.

The product of its (nonzero) digits is 40320, while the sum is 39.

The square root of 1668417501 is about 40846.2666715087. The cubic root of 1668417501 is about 1186.0461249310.

The spelling of 1668417501 in words is "one billion, six hundred sixty-eight million, four hundred seventeen thousand, five hundred one".