18520128541 has 8 divisors (see below), whose sum is σ = 18576728064. Its totient is φ = 18463572720.

The previous prime is 18520128521. The next prime is 18520128547. The reversal of 18520128541 is 14582102581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18520128541 is a prime.

It is a super-2 number, since 2×18520128541² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18520128541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18520128547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 969876 + ... + 988786.

It is an arithmetic number, because the mean of its divisors is an integer number (2322091008).

Almost surely, 2^18520128541 is an apocalyptic number.

It is an amenable number.

18520128541 is a deficient number, since it is larger than the sum of its proper divisors (56599523).

18520128541 is a wasteful number, since it uses less digits than its factorization.

18520128541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21851.

The product of its (nonzero) digits is 25600, while the sum is 37.

The spelling of 18520128541 in words is "eighteen billion, five hundred twenty million, one hundred twenty-eight thousand, five hundred forty-one".