1220545523205 has 48 divisors (see below), whose sum is σ = 2169420454656. Its totient is φ = 634433591040.

The previous prime is 1220545523137. The next prime is 1220545523221. The reversal of 1220545523205 is 5023255450221.

1220545523205 is a `hidden beast` number, since 1 + 2 + 20 + 54 + 552 + 32 + 0 + 5 = 666.

It is not a de Polignac number, because 1220545523205 - 2⁷ = 1220545523077 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1220545523205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1477144 + ... + 2150126.

It is an arithmetic number, because the mean of its divisors is an integer number (45196259472).

Almost surely, 2^{1220545523205} is an apocalyptic number.

1220545523205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1220545523205 is a deficient number, since it is larger than the sum of its proper divisors (948874931451).

1220545523205 is a wasteful number, since it uses less digits than its factorization.

1220545523205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 674018 (or 674015 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The spelling of 1220545523205 in words is "one trillion, two hundred twenty billion, five hundred forty-five million, five hundred twenty-three thousand, two hundred five".