1327545617581 has 4 divisors (see below), whose sum is σ = 1373323052700. Its totient is φ = 1281768182464.

The previous prime is 1327545617521. The next prime is 1327545617599. The reversal of 1327545617581 is 1857165457231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1039514828356 + 288030789225 = 1019566^2 + 536685^2 .

It is a cyclic number.

It is not a de Polignac number, because 1327545617581 - 2¹¹ = 1327545615533 is a prime.

It is a super-2 number, since 2×1327545617581² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1327545617521) 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, 22888717516 + ... + 22888717573.

It is an arithmetic number, because the mean of its divisors is an integer number (343330763175).

Almost surely, 2^{1327545617581} is an apocalyptic number.

It is an amenable number.

1327545617581 is a deficient number, since it is larger than the sum of its proper divisors (45777435119).

1327545617581 is an equidigital number, since it uses as much as digits as its factorization.

1327545617581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45777435118.

The product of its digits is 7056000, while the sum is 55.

The spelling of 1327545617581 in words is "one trillion, three hundred twenty-seven billion, five hundred forty-five million, six hundred seventeen thousand, five hundred eighty-one".