18049155571 has 8 divisors (see below), whose sum is σ = 18130773024. Its totient is φ = 17967574080.

The previous prime is 18049155559. The next prime is 18049155577. The reversal of 18049155571 is 17555194081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18049155571 - 2¹⁹ = 18048631283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18049155577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1798650 + ... + 1808656.

It is an arithmetic number, because the mean of its divisors is an integer number (2266346628).

Almost surely, 2^18049155571 is an apocalyptic number.

18049155571 is a deficient number, since it is larger than the sum of its proper divisors (81617453).

18049155571 is a wasteful number, since it uses less digits than its factorization.

18049155571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17981.

The product of its (nonzero) digits is 252000, while the sum is 46.

The spelling of 18049155571 in words is "eighteen billion, forty-nine million, one hundred fifty-five thousand, five hundred seventy-one".