1366799813 has 8 divisors (see below), whose sum is σ = 1449469080. Its totient is φ = 1284382720.

The previous prime is 1366799807. The next prime is 1366799831. The reversal of 1366799813 is 3189976631.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 458259649 + 908540164 = 21407^2 + 30142^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1366799813 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 (1366799893) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51818 + ... + 73611.

It is an arithmetic number, because the mean of its divisors is an integer number (181183635).

Almost surely, 2^1366799813 is an apocalyptic number.

It is an amenable number.

1366799813 is a deficient number, since it is larger than the sum of its proper divisors (82669267).

1366799813 is a wasteful number, since it uses less digits than its factorization.

1366799813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126087.

The product of its digits is 1469664, while the sum is 53.

The square root of 1366799813 is about 36970.2557875923. The cubic root of 1366799813 is about 1109.7750844240.

The spelling of 1366799813 in words is "one billion, three hundred sixty-six million, seven hundred ninety-nine thousand, eight hundred thirteen".