18421509485 has 64 divisors (see below), whose sum is σ = 25617876480. Its totient is φ = 12631449600.

The previous prime is 18421509473. The next prime is 18421509487. The reversal of 18421509485 is 58490512481.

It is not a de Polignac number, because 18421509485 - 2¹⁰ = 18421508461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18421509487) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4136510 + ... + 4140960.

It is an arithmetic number, because the mean of its divisors is an integer number (400279320).

Almost surely, 2^18421509485 is an apocalyptic number.

It is an amenable number.

18421509485 is a deficient number, since it is larger than the sum of its proper divisors (7196366995).

18421509485 is a wasteful number, since it uses less digits than its factorization.

18421509485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4598.

The product of its (nonzero) digits is 460800, while the sum is 47.

The spelling of 18421509485 in words is "eighteen billion, four hundred twenty-one million, five hundred nine thousand, four hundred eighty-five".