1366821146691 has 512 divisors, whose sum is σ = 3135283200000. Its totient is φ = 564141957120.

The previous prime is 1366821146689. The next prime is 1366821146753. The reversal of 1366821146691 is 1966411286631.

1366821146691 is a `hidden beast` number, since 1 + 3 + 6 + 6 + 82 + 11 + 466 + 91 = 666.

It is not a de Polignac number, because 1366821146691 - 2¹ = 1366821146689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1366821146681) by changing a digit.

It is a polite number, since it can be written in 511 ways as a sum of consecutive naturals, for example, 253159210 + ... + 253164608.

It is an arithmetic number, because the mean of its divisors is an integer number (6123600000).

Almost surely, 2^{1366821146691} is an apocalyptic number.

1366821146691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1366821146691 is an abundant number, since it is smaller than the sum of its proper divisors (1768462053309).

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

1366821146691 is a wasteful number, since it uses less digits than its factorization.

1366821146691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5504 (or 5498 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The spelling of 1366821146691 in words is "one trillion, three hundred sixty-six billion, eight hundred twenty-one million, one hundred forty-six thousand, six hundred ninety-one".