1366686849 has 16 divisors (see below), whose sum is σ = 1988815104. Its totient is φ = 827917200.

The previous prime is 1366686823. The next prime is 1366686851. The reversal of 1366686849 is 9486866631.

It is a happy number.

It is not a de Polignac number, because 1366686849 - 2¹⁹ = 1366162561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1366686889) 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, 75342 + ... + 91704.

It is an arithmetic number, because the mean of its divisors is an integer number (124300944).

Almost surely, 2^1366686849 is an apocalyptic number.

It is an amenable number.

1366686849 is a deficient number, since it is larger than the sum of its proper divisors (622128255).

1366686849 is a wasteful number, since it uses less digits than its factorization.

1366686849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18908.

The product of its digits is 8957952, while the sum is 57.

The square root of 1366686849 is about 36968.7279873138. The cubic root of 1366686849 is about 1109.7445098207.

The spelling of 1366686849 in words is "one billion, three hundred sixty-six million, six hundred eighty-six thousand, eight hundred forty-nine".