1642105261241 has 4 divisors (see below), whose sum is σ = 1669025019684. Its totient is φ = 1615185502800.

The previous prime is 1642105261219. The next prime is 1642105261283. The reversal of 1642105261241 is 1421625012461.

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 200914615225 + 1441190646016 = 448235^2 + 1200496^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642105261241 - 2⁶ = 1642105261177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1642105261141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13459879130 + ... + 13459879251.

It is an arithmetic number, because the mean of its divisors is an integer number (417256254921).

Almost surely, 2^{1642105261241} is an apocalyptic number.

It is an amenable number.

1642105261241 is a deficient number, since it is larger than the sum of its proper divisors (26919758443).

1642105261241 is an equidigital number, since it uses as much as digits as its factorization.

1642105261241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26919758442.

The product of its (nonzero) digits is 23040, while the sum is 35.

The spelling of 1642105261241 in words is "one trillion, six hundred forty-two billion, one hundred five million, two hundred sixty-one thousand, two hundred forty-one".