1605005005555 has 20 divisors (see below), whose sum is σ = 2246873329872. Its totient is φ = 1100574852720.

The previous prime is 1605005005519. The next prime is 1605005005621. The reversal of 1605005005555 is 5555005005061.

It is a de Polignac number, because none of the positive numbers 2^k-1605005005555 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 66835351 + ... + 66859360.

Almost surely, 2^{1605005005555} is an apocalyptic number.

1605005005555 is a deficient number, since it is larger than the sum of its proper divisors (641868324317).

1605005005555 is an frugal number, since it uses more digits than its factorization.

1605005005555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133694744 (or 133694723 counting only the distinct ones).

The product of its (nonzero) digits is 93750, while the sum is 37.

The spelling of 1605005005555 in words is "one trillion, six hundred five billion, five million, five thousand, five hundred fifty-five".