1366986687 has 16 divisors (see below), whose sum is σ = 1988977152. Its totient is φ = 828213120.

The previous prime is 1366986679. The next prime is 1366986697. The reversal of 1366986687 is 7866896631.

It is not a de Polignac number, because 1366986687 - 2³ = 1366986679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1366986687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366986667) 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, 166503 + ... + 174519.

It is an arithmetic number, because the mean of its divisors is an integer number (124311072).

Almost surely, 2^1366986687 is an apocalyptic number.

1366986687 is a deficient number, since it is larger than the sum of its proper divisors (621990465).

1366986687 is a wasteful number, since it uses less digits than its factorization.

1366986687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13198.

The product of its digits is 15676416, while the sum is 60.

The square root of 1366986687 is about 36972.7830572707. The cubic root of 1366986687 is about 1109.8256596573.

The spelling of 1366986687 in words is "one billion, three hundred sixty-six million, nine hundred eighty-six thousand, six hundred eighty-seven".