1816258778447 has 8 divisors (see below), whose sum is σ = 1841174806176. Its totient is φ = 1791343717632.

The previous prime is 1816258778371. The next prime is 1816258778461. The reversal of 1816258778447 is 7448778526181.

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 1816258778447 - 2¹⁰ = 1816258777423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816258778497) 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 7 ways as a sum of consecutive naturals, for example, 4062983 + ... + 4487799.

It is an arithmetic number, because the mean of its divisors is an integer number (230146850772).

Almost surely, 2^{1816258778447} is an apocalyptic number.

1816258778447 is a deficient number, since it is larger than the sum of its proper divisors (24916027729).

1816258778447 is an equidigital number, since it uses as much as digits as its factorization.

1816258778447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483457.

The product of its digits is 168591360, while the sum is 68.

The spelling of 1816258778447 in words is "one trillion, eight hundred sixteen billion, two hundred fifty-eight million, seven hundred seventy-eight thousand, four hundred forty-seven".