18282778281 has 24 divisors (see below), whose sum is σ = 26673192000. Its totient is φ = 12066828192.

The previous prime is 18282778277. The next prime is 18282778321. The reversal of 18282778281 is 18287728281.

It is a happy number.

18282778281 is a `hidden beast` number, since 18 + 282 + 7 + 78 + 281 = 666.

It is not a de Polignac number, because 18282778281 - 2² = 18282778277 is a prime.

It is a super-3 number, since 3×18282778281³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (18282778981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 428755 + ... + 469463.

It is an arithmetic number, because the mean of its divisors is an integer number (1111383000).

Almost surely, 2^18282778281 is an apocalyptic number.

It is an amenable number.

18282778281 is a deficient number, since it is larger than the sum of its proper divisors (8390413719).

18282778281 is a wasteful number, since it uses less digits than its factorization.

18282778281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41213 (or 41210 counting only the distinct ones).

The product of its digits is 1605632, while the sum is 54.

The spelling of 18282778281 in words is "eighteen billion, two hundred eighty-two million, seven hundred seventy-eight thousand, two hundred eighty-one".