18887162805555 has 32 divisors (see below), whose sum is σ = 32966943770880. Its totient is φ = 9157340158080.

The previous prime is 18887162805527. The next prime is 18887162805677. The reversal of 18887162805555 is 55550826178881.

It is a de Polignac number, because none of the positive numbers 2^k-18887162805555 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18887162805555.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24860709 + ... + 25609161.

It is an arithmetic number, because the mean of its divisors is an integer number (1030216992840).

Almost surely, 2^{18887162805555} is an apocalyptic number.

18887162805555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18887162805555 is a deficient number, since it is larger than the sum of its proper divisors (14079780965325).

18887162805555 is a wasteful number, since it uses less digits than its factorization.

18887162805555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 901411.

The product of its (nonzero) digits is 215040000, while the sum is 69.

The spelling of 18887162805555 in words is "eighteen trillion, eight hundred eighty-seven billion, one hundred sixty-two million, eight hundred five thousand, five hundred fifty-five".