2005501421551 has 4 divisors (see below), whose sum is σ = 2059704162712. Its totient is φ = 1951298680392.

The previous prime is 2005501421537. The next prime is 2005501421591. The reversal of 2005501421551 is 1551241055002.

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

It is a cyclic number.

It is not a de Polignac number, because 2005501421551 - 2²⁵ = 2005467867119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2005501421591) 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, 27101370525 + ... + 27101370598.

It is an arithmetic number, because the mean of its divisors is an integer number (514926040678).

Almost surely, 2^{2005501421551} is an apocalyptic number.

2005501421551 is a deficient number, since it is larger than the sum of its proper divisors (54202741161).

2005501421551 is an equidigital number, since it uses as much as digits as its factorization.

2005501421551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54202741160.

The product of its (nonzero) digits is 10000, while the sum is 31.

Adding to 2005501421551 its reverse (1551241055002), we get a palindrome (3556742476553).

The spelling of 2005501421551 in words is "two trillion, five billion, five hundred one million, four hundred twenty-one thousand, five hundred fifty-one".