18628783311555 has 40 divisors (see below), whose sum is σ = 33398713933200. Its totient is φ = 9933894748224.

The previous prime is 18628783311553. The next prime is 18628783311557. The reversal of 18628783311555 is 55511338782681.

18628783311555 is a `hidden beast` number, since 1 + 8 + 6 + 2 + 8 + 78 + 3 + 3 + 1 + 1 + 555 = 666.

It is an interprime number because it is at equal distance from previous prime (18628783311553) and next prime (18628783311557).

It is not a de Polignac number, because 18628783311555 - 2¹ = 18628783311553 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18628783311492 and 18628783311501.

It is not an unprimeable number, because it can be changed into a prime (18628783311553) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 602025 + ... + 6133514.

It is an arithmetic number, because the mean of its divisors is an integer number (834967848330).

Almost surely, 2^{18628783311555} is an apocalyptic number.

18628783311555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18628783311555 is a deficient number, since it is larger than the sum of its proper divisors (14769930621645).

18628783311555 is an equidigital number, since it uses as much as digits as its factorization.

18628783311555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6742385 (or 6742376 counting only the distinct ones).

The product of its digits is 48384000, while the sum is 63.

The spelling of 18628783311555 in words is "eighteen trillion, six hundred twenty-eight billion, seven hundred eighty-three million, three hundred eleven thousand, five hundred fifty-five".