1551142320205 has 4 divisors (see below), whose sum is σ = 1861370784252. Its totient is φ = 1240913856160.

The previous prime is 1551142320191. The next prime is 1551142320257. The reversal of 1551142320205 is 5020232411551.

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 429095742916 + 1122046577289 = 655054^2 + 1059267^2 .

It is not a de Polignac number, because 1551142320205 - 2⁵ = 1551142320173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155114232016 + ... + 155114232025.

It is an arithmetic number, because the mean of its divisors is an integer number (465342696063).

Almost surely, 2^{1551142320205} is an apocalyptic number.

It is an amenable number.

1551142320205 is a deficient number, since it is larger than the sum of its proper divisors (310228464047).

1551142320205 is an equidigital number, since it uses as much as digits as its factorization.

1551142320205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310228464046.

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 1551142320205 its reverse (5020232411551), we get a palindrome (6571374731756).

The spelling of 1551142320205 in words is "one trillion, five hundred fifty-one billion, one hundred forty-two million, three hundred twenty thousand, two hundred five".