1988225021205 has 12 divisors (see below), whose sum is σ = 3446256703500. Its totient is φ = 1060386677952.

The previous prime is 1988225021143. The next prime is 1988225021231. The reversal of 1988225021205 is 5021205228891.

1988225021205 is a `hidden beast` number, since 19 + 8 + 8 + 2 + 2 + 502 + 120 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1384994752164 + 603230269041 = 1176858^2 + 776679^2 .

It is not a de Polignac number, because 1988225021205 - 2¹⁷ = 1988224890133 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 44182778249 = 1988225021205 / (1 + 9 + 8 + 8 + 2 + 2 + 5 + 0 + 2 + 1 + 2 + 0 + 5).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22091389080 + ... + 22091389169.

It is an arithmetic number, because the mean of its divisors is an integer number (287188058625).

Almost surely, 2^{1988225021205} is an apocalyptic number.

1988225021205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1988225021205 is a deficient number, since it is larger than the sum of its proper divisors (1458031682295).

1988225021205 is a wasteful number, since it uses less digits than its factorization.

1988225021205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44182778260 (or 44182778257 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 1988225021205 in words is "one trillion, nine hundred eighty-eight billion, two hundred twenty-five million, twenty-one thousand, two hundred five".