1668722635807 has 8 divisors (see below), whose sum is σ = 1671754987584. Its totient is φ = 1665691020288.

The previous prime is 1668722635709. The next prime is 1668722635891. The reversal of 1668722635807 is 7085362278661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1668722635807 - 2¹⁵ = 1668722603039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668722635607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4459183 + ... + 4818895.

It is an arithmetic number, because the mean of its divisors is an integer number (208969373448).

Almost surely, 2^{1668722635807} is an apocalyptic number.

1668722635807 is a deficient number, since it is larger than the sum of its proper divisors (3032351777).

1668722635807 is an equidigital number, since it uses as much as digits as its factorization.

1668722635807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368129.

The product of its (nonzero) digits is 40642560, while the sum is 61.

The spelling of 1668722635807 in words is "one trillion, six hundred sixty-eight billion, seven hundred twenty-two million, six hundred thirty-five thousand, eight hundred seven".