1366556394115 has 16 divisors (see below), whose sum is σ = 1789781492736. Its totient is φ = 993395340000.

The previous prime is 1366556394109. The next prime is 1366556394139. The reversal of 1366556394115 is 5114936556631.

It is a happy number.

It is not a de Polignac number, because 1366556394115 - 2¹⁵ = 1366556361347 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5679261 + ... + 5914990.

It is an arithmetic number, because the mean of its divisors is an integer number (111861343296).

Almost surely, 2^{1366556394115} is an apocalyptic number.

1366556394115 is a deficient number, since it is larger than the sum of its proper divisors (423225098621).

1366556394115 is a wasteful number, since it uses less digits than its factorization.

1366556394115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11596410.

The product of its digits is 8748000, while the sum is 55.

It can be divided in two parts, 1366556 and 394115, that added together give a palindrome (1760671).

The spelling of 1366556394115 in words is "one trillion, three hundred sixty-six billion, five hundred fifty-six million, three hundred ninety-four thousand, one hundred fifteen".