18466266481 has 12 divisors (see below), whose sum is σ = 20000173212. Its totient is φ = 17042241216.

The previous prime is 18466266433. The next prime is 18466266487.

It is a happy number.

18466266481 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 6 ways, for example, as 708038881 + 17758227600 = 26609^2 + 133260^2 .

It is not a de Polignac number, because 18466266481 - 2¹⁵ = 18466233713 is a prime.

It is a super-2 number, since 2×18466266481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18466266487) 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, 1161075 + ... + 1176871.

It is an arithmetic number, because the mean of its divisors is an integer number (1666681101).

Almost surely, 2^18466266481 is an apocalyptic number.

It is an amenable number.

18466266481 is a deficient number, since it is larger than the sum of its proper divisors (1533906731).

18466266481 is a wasteful number, since it uses less digits than its factorization.

18466266481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22740 (or 22727 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 52.

The spelling of 18466266481 in words is "eighteen billion, four hundred sixty-six million, two hundred sixty-six thousand, four hundred eighty-one".