18507378434 has 16 divisors (see below), whose sum is σ = 28572971616. Its totient is φ = 8985194400.

The previous prime is 18507378419. The next prime is 18507378473. The reversal of 18507378434 is 43487370581.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 517532 + ... + 552135.

It is an arithmetic number, because the mean of its divisors is an integer number (1785810726).

Almost surely, 2^18507378434 is an apocalyptic number.

18507378434 is a deficient number, since it is larger than the sum of its proper divisors (10065593182).

18507378434 is a wasteful number, since it uses less digits than its factorization.

18507378434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1069921.

The product of its (nonzero) digits is 2257920, while the sum is 50.

The spelling of 18507378434 in words is "eighteen billion, five hundred seven million, three hundred seventy-eight thousand, four hundred thirty-four".