18546064581 has 12 divisors (see below), whose sum is σ = 27180458816. Its totient is φ = 11240038920.

The previous prime is 18546064577. The next prime is 18546064627.

18546064581 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 18546064581 - 2² = 18546064577 is a prime.

It is a super-2 number, since 2×18546064581² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18546064581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18546064081) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25545181 + ... + 25545906.

Almost surely, 2^18546064581 is an apocalyptic number.

18546064581 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18546064581 is a deficient number, since it is larger than the sum of its proper divisors (8634394235).

18546064581 is a wasteful number, since it uses less digits than its factorization.

18546064581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51091112 (or 51091101 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 48.

The spelling of 18546064581 in words is "eighteen billion, five hundred forty-six million, sixty-four thousand, five hundred eighty-one".