1326845681 has 4 divisors (see below), whose sum is σ = 1516395072. Its totient is φ = 1137296292.

The previous prime is 1326845651. The next prime is 1326845687. The reversal of 1326845681 is 1865486231.

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 1326845681 - 2¹⁰ = 1326844657 is a prime.

It is a super-2 number, since 2×1326845681² = 3521038922376707522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1326845687) 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, 94774685 + ... + 94774698.

It is an arithmetic number, because the mean of its divisors is an integer number (379098768).

Almost surely, 2^1326845681 is an apocalyptic number.

It is an amenable number.

1326845681 is a deficient number, since it is larger than the sum of its proper divisors (189549391).

1326845681 is an equidigital number, since it uses as much as digits as its factorization.

1326845681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189549390.

The product of its digits is 276480, while the sum is 44.

The square root of 1326845681 is about 36425.8930020940. The cubic root of 1326845681 is about 1098.8543667588.

The spelling of 1326845681 in words is "one billion, three hundred twenty-six million, eight hundred forty-five thousand, six hundred eighty-one".