1327857312661 has 4 divisors (see below), whose sum is σ = 1448571613824. Its totient is φ = 1207143011500.

The previous prime is 1327857312647. The next prime is 1327857312709. The reversal of 1327857312661 is 1662137587231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1327857312661 - 2¹⁹ = 1327856788373 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1327857312599 and 1327857312608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1327857312161) 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, 60357150565 + ... + 60357150586.

It is an arithmetic number, because the mean of its divisors is an integer number (362142903456).

Almost surely, 2^{1327857312661} is an apocalyptic number.

1327857312661 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1327857312661 is a deficient number, since it is larger than the sum of its proper divisors (120714301163).

1327857312661 is a wasteful number, since it uses less digits than its factorization.

1327857312661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120714301162.

The product of its digits is 2540160, while the sum is 52.

The spelling of 1327857312661 in words is "one trillion, three hundred twenty-seven billion, eight hundred fifty-seven million, three hundred twelve thousand, six hundred sixty-one".