1605643031056 has 40 divisors (see below), whose sum is σ = 3140198443008. Its totient is φ = 795304128000.

The previous prime is 1605643031033. The next prime is 1605643031063. The reversal of 1605643031056 is 6501303465061.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 353560 + ... + 1826551.

Almost surely, 2^{1605643031056} is an apocalyptic number.

1605643031056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1605643031056 is a deficient number, since it is larger than the sum of its proper divisors (1534555411952).

1605643031056 is a wasteful number, since it uses less digits than its factorization.

1605643031056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180551 (or 2180545 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 1605643031056 in words is "one trillion, six hundred five billion, six hundred forty-three million, thirty-one thousand, fifty-six".