18521601242 has 8 divisors (see below), whose sum is σ = 29244633600. Its totient is φ = 8773390044.

The previous prime is 18521601221. The next prime is 18521601247. The reversal of 18521601242 is 24210612581.

18521601242 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 18521601199 and 18521601208.

It is not an unprimeable number, because it can be changed into a prime (18521601247) 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, 243705242 + ... + 243705317.

It is an arithmetic number, because the mean of its divisors is an integer number (3655579200).

Almost surely, 2^18521601242 is an apocalyptic number.

18521601242 is a deficient number, since it is larger than the sum of its proper divisors (10723032358).

18521601242 is a wasteful number, since it uses less digits than its factorization.

18521601242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487410580.

The product of its (nonzero) digits is 7680, while the sum is 32.

The spelling of 18521601242 in words is "eighteen billion, five hundred twenty-one million, six hundred one thousand, two hundred forty-two".