1801778105 has 8 divisors (see below), whose sum is σ = 2177916552. Its totient is φ = 1430900608.

The previous prime is 1801778093. The next prime is 1801778119. The reversal of 1801778105 is 5018771081.

It can be written as a sum of positive squares in 4 ways, for example, as 552297001 + 1249481104 = 23501^2 + 35348^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1801778105 - 2²⁰ = 1800729529 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1314482 + ... + 1315851.

It is an arithmetic number, because the mean of its divisors is an integer number (272239569).

Almost surely, 2^1801778105 is an apocalyptic number.

It is an amenable number.

1801778105 is a deficient number, since it is larger than the sum of its proper divisors (376138447).

1801778105 is a wasteful number, since it uses less digits than its factorization.

1801778105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630475.

The product of its (nonzero) digits is 15680, while the sum is 38.

The square root of 1801778105 is about 42447.3568670654. The cubic root of 1801778105 is about 1216.8408152129.

The spelling of 1801778105 in words is "one billion, eight hundred one million, seven hundred seventy-eight thousand, one hundred five".