1980485205205 has 8 divisors (see below), whose sum is σ = 2559396265272. Its totient is φ = 1462512151488.

The previous prime is 1980485205169. The next prime is 1980485205233. The reversal of 1980485205205 is 5025025840891.

It can be written as a sum of positive squares in 4 ways, for example, as 10330486321 + 1970154718884 = 101639^2 + 1403622^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1980485205205 - 2⁹ = 1980485204693 is a prime.

It is a Duffinian number.

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, 15234501514 + ... + 15234501643.

It is an arithmetic number, because the mean of its divisors is an integer number (319924533159).

Almost surely, 2^{1980485205205} is an apocalyptic number.

It is an amenable number.

1980485205205 is a deficient number, since it is larger than the sum of its proper divisors (578911060067).

1980485205205 is a wasteful number, since it uses less digits than its factorization.

1980485205205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30469003175.

The product of its (nonzero) digits is 1152000, while the sum is 49.

The spelling of 1980485205205 in words is "one trillion, nine hundred eighty billion, four hundred eighty-five million, two hundred five thousand, two hundred five".