1388396866566 has 16 divisors (see below), whose sum is σ = 2787598381104. Its totient is φ = 460998180864.

The previous prime is 1388396866547. The next prime is 1388396866573. The reversal of 1388396866566 is 6656686938831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450191995 + ... + 450195078.

It is an arithmetic number, because the mean of its divisors is an integer number (174224898819).

Almost surely, 2^{1388396866566} is an apocalyptic number.

1388396866566 is an abundant number, since it is smaller than the sum of its proper divisors (1399201514538).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1388396866566 is a wasteful number, since it uses less digits than its factorization.

1388396866566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900387335.

The product of its digits is 1612431360, while the sum is 75.

The spelling of 1388396866566 in words is "one trillion, three hundred eighty-eight billion, three hundred ninety-six million, eight hundred sixty-six thousand, five hundred sixty-six".