1388888611111 has 16 divisors (see below), whose sum is σ = 1426232844288. Its totient is φ = 1351872784800.

The previous prime is 1388888611109. The next prime is 1388888611181. The reversal of 1388888611111 is 1111168888831.

1388888611111 is a nontrivial binomial coefficient, being equal to C(1666667, 2).

It is a cyclic number.

It is not a de Polignac number, because 1388888611111 - 2¹ = 1388888611109 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 (1388888611181) 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, 39148921 + ... + 39184381.

It is an arithmetic number, because the mean of its divisors is an integer number (89139552768).

Almost surely, 2^{1388888611111} is an apocalyptic number.

1388888611111 is the 1666666-th triangular number.

1388888611111 is the 555556-th centered nonagonal number.

1388888611111 is a deficient number, since it is larger than the sum of its proper divisors (37344233177).

1388888611111 is a wasteful number, since it uses less digits than its factorization.

1388888611111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40062.

The product of its digits is 589824, while the sum is 55.

The spelling of 1388888611111 in words is "one trillion, three hundred eighty-eight billion, eight hundred eighty-eight million, six hundred eleven thousand, one hundred eleven".