18279217481 has 16 divisors (see below), whose sum is σ = 20948939520. Its totient is φ = 15624161280.

The previous prime is 18279217471. The next prime is 18279217499. The reversal of 18279217481 is 18471297281.

It is not a de Polignac number, because 18279217481 - 2⁶ = 18279217417 is a prime.

It is a super-2 number, since 2×18279217481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18279217471) 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, 5204516 + ... + 5208026.

It is an arithmetic number, because the mean of its divisors is an integer number (1309308720).

Almost surely, 2^18279217481 is an apocalyptic number.

It is an amenable number.

18279217481 is a deficient number, since it is larger than the sum of its proper divisors (2669722039).

18279217481 is a wasteful number, since it uses less digits than its factorization.

18279217481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5384.

The product of its digits is 451584, while the sum is 50.

The spelling of 18279217481 in words is "eighteen billion, two hundred seventy-nine million, two hundred seventeen thousand, four hundred eighty-one".