18638540542 has 8 divisors (see below), whose sum is σ = 29429274600. Its totient is φ = 8828782344.

The previous prime is 18638540527. The next prime is 18638540573. The reversal of 18638540542 is 24504583681.

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 = 18638540492 and 18638540501.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 245243917 + ... + 245243992.

It is an arithmetic number, because the mean of its divisors is an integer number (3678659325).

Almost surely, 2^18638540542 is an apocalyptic number.

18638540542 is a deficient number, since it is larger than the sum of its proper divisors (10790734058).

18638540542 is a wasteful number, since it uses less digits than its factorization.

18638540542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490487930.

The product of its (nonzero) digits is 921600, while the sum is 46.

The spelling of 18638540542 in words is "eighteen billion, six hundred thirty-eight million, five hundred forty thousand, five hundred forty-two".