18535490521 has 8 divisors (see below), whose sum is σ = 18588637760. Its totient is φ = 18482376528.

The previous prime is 18535490513. The next prime is 18535490551. The reversal of 18535490521 is 12509453581.

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

It is a cyclic number.

It is not a de Polignac number, because 18535490521 - 2³ = 18535490513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18535490551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1478140 + ... + 1490626.

It is an arithmetic number, because the mean of its divisors is an integer number (2323579720).

Almost surely, 2^18535490521 is an apocalyptic number.

It is an amenable number.

18535490521 is a deficient number, since it is larger than the sum of its proper divisors (53147239).

18535490521 is a wasteful number, since it uses less digits than its factorization.

18535490521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16623.

The product of its (nonzero) digits is 216000, while the sum is 43.

The spelling of 18535490521 in words is "eighteen billion, five hundred thirty-five million, four hundred ninety thousand, five hundred twenty-one".