18541854721 has 16 divisors (see below), whose sum is σ = 20175535744. Its totient is φ = 16938025344.

The previous prime is 18541854703. The next prime is 18541854743. The reversal of 18541854721 is 12745814581.

It is a de Polignac number, because none of the positive numbers 2^k-18541854721 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18541854701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2496205 + ... + 2503621.

It is an arithmetic number, because the mean of its divisors is an integer number (1260970984).

Almost surely, 2^18541854721 is an apocalyptic number.

It is an amenable number.

18541854721 is a deficient number, since it is larger than the sum of its proper divisors (1633681023).

18541854721 is a wasteful number, since it uses less digits than its factorization.

18541854721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9400.

The product of its digits is 358400, while the sum is 46.

The spelling of 18541854721 in words is "eighteen billion, five hundred forty-one million, eight hundred fifty-four thousand, seven hundred twenty-one".