1800416782081 has 4 divisors (see below), whose sum is σ = 1844329386564. Its totient is φ = 1756504177600.

The previous prime is 1800416782079. The next prime is 1800416782117. The reversal of 1800416782081 is 1802876140081.

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 991647514225 + 808769267856 = 995815^2 + 899316^2 .

It is a cyclic number.

It is not a de Polignac number, because 1800416782081 - 2¹ = 1800416782079 is a prime.

It is a super-2 number, since 2×1800416782081² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1800416785081) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21956302180 + ... + 21956302261.

It is an arithmetic number, because the mean of its divisors is an integer number (461082346641).

Almost surely, 2^{1800416782081} is an apocalyptic number.

It is an amenable number.

1800416782081 is a deficient number, since it is larger than the sum of its proper divisors (43912604483).

1800416782081 is an equidigital number, since it uses as much as digits as its factorization.

1800416782081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43912604482.

The product of its (nonzero) digits is 172032, while the sum is 46.

The spelling of 1800416782081 in words is "one trillion, eight hundred billion, four hundred sixteen million, seven hundred eighty-two thousand, eighty-one".