2631648101809 has 4 divisors (see below), whose sum is σ = 2631654172404. Its totient is φ = 2631642031216.

The previous prime is 2631648101791. The next prime is 2631648101987. The reversal of 2631648101809 is 9081018461362.

It is a happy number.

2631648101809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2083611414784 + 548036687025 = 1443472^2 + 740295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2631648101809 - 2¹³ = 2631648093617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2631648104809) 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, 2330482 + ... + 3270235.

It is an arithmetic number, because the mean of its divisors is an integer number (657913543101).

Almost surely, 2^{2631648101809} is an apocalyptic number.

It is an amenable number.

2631648101809 is a deficient number, since it is larger than the sum of its proper divisors (6070595).

2631648101809 is an equidigital number, since it uses as much as digits as its factorization.

2631648101809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6070594.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 2631648101809 in words is "two trillion, six hundred thirty-one billion, six hundred forty-eight million, one hundred one thousand, eight hundred nine".