1605265656 has 16 divisors (see below), whose sum is σ = 4013164200. Its totient is φ = 535088544.

The previous prime is 1605265639. The next prime is 1605265679. The reversal of 1605265656 is 6565625061.

It is a super-2 number, since 2×1605265656² = 5153755652666220672, which contains 22 as substring.

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, 33443011 + ... + 33443058.

Almost surely, 2^1605265656 is an apocalyptic number.

It is an amenable number.

1605265656 is an abundant number, since it is smaller than the sum of its proper divisors (2407898544).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1605265656 is a wasteful number, since it uses less digits than its factorization.

1605265656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66886078 (or 66886074 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 42.

The square root of 1605265656 is about 40065.7666343725. The cubic root of 1605265656 is about 1170.8887629363. Note that the first 3 decimals are identical.

The spelling of 1605265656 in words is "one billion, six hundred five million, two hundred sixty-five thousand, six hundred fifty-six".