1668888388501 has 16 divisors (see below), whose sum is σ = 1729751163840. Its totient is φ = 1609422727680.

The previous prime is 1668888388499. The next prime is 1668888388513. The reversal of 1668888388501 is 1058838888661.

It is a cyclic number.

It is not a de Polignac number, because 1668888388501 - 2¹ = 1668888388499 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 (1668888388561) 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, 684871 + ... + 1951108.

It is an arithmetic number, because the mean of its divisors is an integer number (108109447740).

Almost surely, 2^{1668888388501} is an apocalyptic number.

It is an amenable number.

1668888388501 is a deficient number, since it is larger than the sum of its proper divisors (60862775339).

1668888388501 is a wasteful number, since it uses less digits than its factorization.

1668888388501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2636244.

The product of its (nonzero) digits is 141557760, while the sum is 70.

The spelling of 1668888388501 in words is "one trillion, six hundred sixty-eight billion, eight hundred eighty-eight million, three hundred eighty-eight thousand, five hundred one".