18873478481 has 48 divisors (see below), whose sum is σ = 23227213632. Its totient is φ = 15220275840.

The previous prime is 18873478469. The next prime is 18873478493. The reversal of 18873478481 is 18487437881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18873478469) and next prime (18873478493).

It is not a de Polignac number, because 18873478481 - 2⁶ = 18873478417 is a prime.

It is a super-2 number, since 2×18873478481² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18873478481.

It is not an unprimeable number, because it can be changed into a prime (18873478681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4828730 + ... + 4832636.

It is an arithmetic number, because the mean of its divisors is an integer number (483900284).

Almost surely, 2^18873478481 is an apocalyptic number.

18873478481 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18873478481 is a deficient number, since it is larger than the sum of its proper divisors (4353735151).

18873478481 is a wasteful number, since it uses less digits than its factorization.

18873478481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4062 (or 4051 counting only the distinct ones).

The product of its digits is 9633792, while the sum is 59.

The spelling of 18873478481 in words is "eighteen billion, eight hundred seventy-three million, four hundred seventy-eight thousand, four hundred eighty-one".