1605340642544 has 20 divisors (see below), whose sum is σ = 3110422513224. Its totient is φ = 802650961728.

The previous prime is 1605340642537. The next prime is 1605340642561. The reversal of 1605340642544 is 4452460435061.

It is a junction number, because it is equal to n+sod(n) for n = 1605340642495 and 1605340642504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 513722 + ... + 1864025.

Almost surely, 2^{1605340642544} is an apocalyptic number.

It is an amenable number.

1605340642544 is a deficient number, since it is larger than the sum of its proper divisors (1505081870680).

1605340642544 is a wasteful number, since it uses less digits than its factorization.

1605340642544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2419952 (or 2419946 counting only the distinct ones).

The product of its (nonzero) digits is 1382400, while the sum is 44.

The spelling of 1605340642544 in words is "one trillion, six hundred five billion, three hundred forty million, six hundred forty-two thousand, five hundred forty-four".