18684392784469 has 16 divisors (see below), whose sum is σ = 19336089207600. Its totient is φ = 18033191737344.

The previous prime is 18684392784439. The next prime is 18684392784493. The reversal of 18684392784469 is 96448729348681.

It can be written as a sum of positive squares in 8 ways, for example, as 444335562225 + 18240057222244 = 666585^2 + 4270838^2 .

It is a cyclic number.

It is not a de Polignac number, because 18684392784469 - 2⁹ = 18684392783957 is a prime.

It is a super-2 number, since 2×18684392784469² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18684392784439) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1499904889 + ... + 1499917345.

It is an arithmetic number, because the mean of its divisors is an integer number (1208505575475).

Almost surely, 2^{18684392784469} is an apocalyptic number.

It is an amenable number.

18684392784469 is a deficient number, since it is larger than the sum of its proper divisors (651696423131).

18684392784469 is a wasteful number, since it uses less digits than its factorization.

18684392784469 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28152.

The product of its digits is 4013162496, while the sum is 79.

The spelling of 18684392784469 in words is "eighteen trillion, six hundred eighty-four billion, three hundred ninety-two million, seven hundred eighty-four thousand, four hundred sixty-nine".