18451891954 has 8 divisors (see below), whose sum is σ = 27679386348. Its totient is φ = 9225429840.

The previous prime is 18451891943. The next prime is 18451891961. The reversal of 18451891954 is 45919815481.

It can be written as a sum of positive squares in 2 ways, for example, as 17214752025 + 1237139929 = 131205^2 + 35173^2 .

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 = 18451891895 and 18451891904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 211717 + ... + 285880.

Almost surely, 2^18451891954 is an apocalyptic number.

18451891954 is a deficient number, since it is larger than the sum of its proper divisors (9227494394).

18451891954 is a wasteful number, since it uses less digits than its factorization.

18451891954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516140.

The product of its digits is 2073600, while the sum is 55.

The spelling of 18451891954 in words is "eighteen billion, four hundred fifty-one million, eight hundred ninety-one thousand, nine hundred fifty-four".