18551226541 has 4 divisors (see below), whose sum is σ = 19357801632. Its totient is φ = 17744651452.

The previous prime is 18551226521. The next prime is 18551226583. The reversal of 18551226541 is 14562215581.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18551226541 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18551226494 and 18551226503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18551226521) 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, 403287511 + ... + 403287556.

It is an arithmetic number, because the mean of its divisors is an integer number (4839450408).

Almost surely, 2^18551226541 is an apocalyptic number.

It is an amenable number.

18551226541 is a deficient number, since it is larger than the sum of its proper divisors (806575091).

18551226541 is an equidigital number, since it uses as much as digits as its factorization.

18551226541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806575090.

The product of its digits is 96000, while the sum is 40.

The spelling of 18551226541 in words is "eighteen billion, five hundred fifty-one million, two hundred twenty-six thousand, five hundred forty-one".