18908199505 has 32 divisors (see below), whose sum is σ = 25741699200. Its totient is φ = 13217582592.

The previous prime is 18908199473. The next prime is 18908199533. The reversal of 18908199505 is 50599180981.

It is a cyclic number.

It is not a de Polignac number, because 18908199505 - 2⁵ = 18908199473 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1756981 + ... + 1767709.

It is an arithmetic number, because the mean of its divisors is an integer number (804428100).

Almost surely, 2^18908199505 is an apocalyptic number.

It is an amenable number.

18908199505 is a deficient number, since it is larger than the sum of its proper divisors (6833499695).

18908199505 is a wasteful number, since it uses less digits than its factorization.

18908199505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12193.

The product of its (nonzero) digits is 1166400, while the sum is 55.

The spelling of 18908199505 in words is "eighteen billion, nine hundred eight million, one hundred ninety-nine thousand, five hundred five".