18404684071 has 4 divisors (see below), whose sum is σ = 18406300552. Its totient is φ = 18403067592.

The previous prime is 18404684057. The next prime is 18404684093. The reversal of 18404684071 is 17048640481.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17048640481 = 83 ⋅205405307.

It is a cyclic number.

It is not a de Polignac number, because 18404684071 - 2²¹ = 18402586919 is a prime.

It is a super-2 number, since 2×18404684071² (a number of 21 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 (18404684371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 791040 + ... + 813973.

It is an arithmetic number, because the mean of its divisors is an integer number (4601575138).

Almost surely, 2^18404684071 is an apocalyptic number.

18404684071 is a deficient number, since it is larger than the sum of its proper divisors (1616481).

18404684071 is a wasteful number, since it uses less digits than its factorization.

18404684071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1616480.

The product of its (nonzero) digits is 172032, while the sum is 43.

The spelling of 18404684071 in words is "eighteen billion, four hundred four million, six hundred eighty-four thousand, seventy-one".