18881533441 has 4 divisors (see below), whose sum is σ = 18882753984. Its totient is φ = 18880312900.

The previous prime is 18881533399. The next prime is 18881533493. The reversal of 18881533441 is 14433518881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 14433518881 = 1657 ⋅8710633.

It is a cyclic number.

It is not a de Polignac number, because 18881533441 - 2²³ = 18873144833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18881533391 and 18881533400.

It is not an unprimeable number, because it can be changed into a prime (18881033441) 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, 586765 + ... + 618106.

It is an arithmetic number, because the mean of its divisors is an integer number (4720688496).

Almost surely, 2^18881533441 is an apocalyptic number.

It is an amenable number.

18881533441 is a deficient number, since it is larger than the sum of its proper divisors (1220543).

18881533441 is a wasteful number, since it uses less digits than its factorization.

18881533441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1220542.

The product of its digits is 368640, while the sum is 46.

The spelling of 18881533441 in words is "eighteen billion, eight hundred eighty-one million, five hundred thirty-three thousand, four hundred forty-one".