18781481456 has 40 divisors (see below), whose sum is σ = 38324756880. Its totient is φ = 8891748864.

The previous prime is 18781481441. The next prime is 18781481461. The reversal of 18781481456 is 65418418781.

It is a junction number, because it is equal to n+sod(n) for n = 18781481398 and 18781481407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 591620 + ... + 622556.

It is an arithmetic number, because the mean of its divisors is an integer number (958118922).

Almost surely, 2^18781481456 is an apocalyptic number.

18781481456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18781481456 is an abundant number, since it is smaller than the sum of its proper divisors (19543275424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18781481456 is a wasteful number, since it uses less digits than its factorization.

18781481456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32961 (or 32955 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 53.

The spelling of 18781481456 in words is "eighteen billion, seven hundred eighty-one million, four hundred eighty-one thousand, four hundred fifty-six".