18046567821 has 16 divisors (see below), whose sum is σ = 26818430400. Its totient is φ = 10727371008.

The previous prime is 18046567811. The next prime is 18046567867. The reversal of 18046567821 is 12876564081.

It is not a de Polignac number, because 18046567821 - 2¹⁵ = 18046535053 is a prime.

It is a super-2 number, since 2×18046567821² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18046567811) 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, 9310986 + ... + 9312923.

It is an arithmetic number, because the mean of its divisors is an integer number (1676151900).

Almost surely, 2^18046567821 is an apocalyptic number.

It is an amenable number.

18046567821 is a deficient number, since it is larger than the sum of its proper divisors (8771862579).

18046567821 is a wasteful number, since it uses less digits than its factorization.

18046567821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18623948.

The product of its (nonzero) digits is 645120, while the sum is 48.

The spelling of 18046567821 in words is "eighteen billion, forty-six million, five hundred sixty-seven thousand, eight hundred twenty-one".