18817801774449 has 16 divisors (see below), whose sum is σ = 25235899145472. Its totient is φ = 12472652928528.

The previous prime is 18817801774367. The next prime is 18817801774451. The reversal of 18817801774449 is 94447710871881.

It is not a de Polignac number, because 18817801774449 - 2¹⁹ = 18817801250161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18817801774249) 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 15 ways as a sum of consecutive naturals, for example, 24640447 + ... + 25392660.

It is an arithmetic number, because the mean of its divisors is an integer number (1577243696592).

Almost surely, 2^{18817801774449} is an apocalyptic number.

It is an amenable number.

18817801774449 is a deficient number, since it is larger than the sum of its proper divisors (6418097371023).

18817801774449 is a wasteful number, since it uses less digits than its factorization.

18817801774449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50033836.

The product of its (nonzero) digits is 101154816, while the sum is 69.

The spelling of 18817801774449 in words is "eighteen trillion, eight hundred seventeen billion, eight hundred one million, seven hundred seventy-four thousand, four hundred forty-nine".