2005541321405 has 4 divisors (see below), whose sum is σ = 2406649585692. Its totient is φ = 1604433057120.

The previous prime is 2005541321401. The next prime is 2005541321437. The reversal of 2005541321405 is 5041231455002.

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 1474422490564 + 531118830841 = 1214258^2 + 728779^2 .

It is not a de Polignac number, because 2005541321405 - 2² = 2005541321401 is a prime.

It is a super-2 number, since 2×2005541321405² (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 (2005541321401) 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, 200554132136 + ... + 200554132145.

It is an arithmetic number, because the mean of its divisors is an integer number (601662396423).

Almost surely, 2^{2005541321405} is an apocalyptic number.

It is an amenable number.

2005541321405 is a deficient number, since it is larger than the sum of its proper divisors (401108264287).

2005541321405 is an equidigital number, since it uses as much as digits as its factorization.

2005541321405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401108264286.

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 2005541321405 its reverse (5041231455002), we get a palindrome (7046772776407).

The spelling of 2005541321405 in words is "two trillion, five billion, five hundred forty-one million, three hundred twenty-one thousand, four hundred five".