1605161215568 has 20 divisors (see below), whose sum is σ = 3160983461268. Its totient is φ = 789423548160.

The previous prime is 1605161215531. The next prime is 1605161215601. The reversal of 1605161215568 is 8655121615061.

It can be written as a sum of positive squares in 2 ways, for example, as 792228165184 + 812933050384 = 890072^2 + 901628^2 .

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 3 ways as a sum of consecutive naturals, for example, 822315221 + ... + 822317172.

Almost surely, 2^{1605161215568} is an apocalyptic number.

It is an amenable number.

1605161215568 is a deficient number, since it is larger than the sum of its proper divisors (1555822245700).

1605161215568 is a wasteful number, since it uses less digits than its factorization.

1605161215568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644632462 (or 1644632456 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 47.

The spelling of 1605161215568 in words is "one trillion, six hundred five billion, one hundred sixty-one million, two hundred fifteen thousand, five hundred sixty-eight".