1305604100663 has 4 divisors (see below), whose sum is σ = 1362369496368. Its totient is φ = 1248838704960.

The previous prime is 1305604100639. The next prime is 1305604100687. The reversal of 1305604100663 is 3660014065031.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1305604100639) and next prime (1305604100687).

It is a cyclic number.

It is not a de Polignac number, because 1305604100663 - 2⁸ = 1305604100407 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 (1305601100663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28382697818 + ... + 28382697863.

It is an arithmetic number, because the mean of its divisors is an integer number (340592374092).

Almost surely, 2^{1305604100663} is an apocalyptic number.

1305604100663 is a deficient number, since it is larger than the sum of its proper divisors (56765395705).

1305604100663 is an equidigital number, since it uses as much as digits as its factorization.

1305604100663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56765395704.

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 1305604100663 its reverse (3660014065031), we get a palindrome (4965618165694).

The spelling of 1305604100663 in words is "one trillion, three hundred five billion, six hundred four million, one hundred thousand, six hundred sixty-three".