18551850505 has 16 divisors (see below), whose sum is σ = 22955050944. Its totient is φ = 14382792000.

The previous prime is 18551850463. The next prime is 18551850539. The reversal of 18551850505 is 50505815581.

It is not a de Polignac number, because 18551850505 - 2⁷ = 18551850377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153327 + ... + 246196.

It is an arithmetic number, because the mean of its divisors is an integer number (1434690684).

Almost surely, 2^18551850505 is an apocalyptic number.

It is an amenable number.

18551850505 is a deficient number, since it is larger than the sum of its proper divisors (4403200439).

18551850505 is a wasteful number, since it uses less digits than its factorization.

18551850505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399816.

The product of its (nonzero) digits is 200000, while the sum is 43.

The spelling of 18551850505 in words is "eighteen billion, five hundred fifty-one million, eight hundred fifty thousand, five hundred five".