18926404459 has 4 divisors (see below), whose sum is σ = 18926857600. Its totient is φ = 18925951320.

The previous prime is 18926404451. The next prime is 18926404499. The reversal of 18926404459 is 95440462981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95440462981 = 23 ⋅4149585347.

It is a cyclic number.

It is not a de Polignac number, because 18926404459 - 2³ = 18926404451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18926404451) 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, 156747 + ... + 249844.

It is an arithmetic number, because the mean of its divisors is an integer number (4731714400).

Almost surely, 2^18926404459 is an apocalyptic number.

18926404459 is a deficient number, since it is larger than the sum of its proper divisors (453141).

18926404459 is an equidigital number, since it uses as much as digits as its factorization.

18926404459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453140.

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 18926404459 in words is "eighteen billion, nine hundred twenty-six million, four hundred four thousand, four hundred fifty-nine".