1329809820161 has 8 divisors (see below), whose sum is σ = 1348990102824. Its totient is φ = 1310759573760.

The previous prime is 1329809820107. The next prime is 1329809820169. The reversal of 1329809820161 is 1610289089231.

It can be written as a sum of positive squares in 4 ways, for example, as 453608985025 + 876200835136 = 673505^2 + 936056^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1329809820161 - 2³⁴ = 1312629950977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1329809820169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32488466 + ... + 32529371.

It is an arithmetic number, because the mean of its divisors is an integer number (168623762853).

Almost surely, 2^{1329809820161} is an apocalyptic number.

It is an amenable number.

1329809820161 is a deficient number, since it is larger than the sum of its proper divisors (19180282663).

1329809820161 is a wasteful number, since it uses less digits than its factorization.

1329809820161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65018131.

The product of its (nonzero) digits is 373248, while the sum is 50.

The spelling of 1329809820161 in words is "one trillion, three hundred twenty-nine billion, eight hundred nine million, eight hundred twenty thousand, one hundred sixty-one".