1645555834 has 32 divisors (see below), whose sum is σ = 2890668816. Its totient is φ = 695485440.

The previous prime is 1645555829. The next prime is 1645555841. The reversal of 1645555834 is 4385555461.

It can be written as a sum of positive squares in 8 ways, for example, as 1446661225 + 198894609 = 38035^2 + 14103^2 .

It is a super-2 number, since 2×1645555834² = 5415708005622871112, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33957 + ... + 66664.

Almost surely, 2^1645555834 is an apocalyptic number.

1645555834 is a deficient number, since it is larger than the sum of its proper divisors (1245112982).

1645555834 is a wasteful number, since it uses less digits than its factorization.

1645555834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100690.

The product of its digits is 1440000, while the sum is 46.

The square root of 1645555834 is about 40565.4512362429. The cubic root of 1645555834 is about 1180.6038836610.

The spelling of 1645555834 in words is "one billion, six hundred forty-five million, five hundred fifty-five thousand, eight hundred thirty-four".