1645155442 has 16 divisors (see below), whose sum is σ = 2917517760. Its totient is φ = 680753808.

The previous prime is 1645155409. The next prime is 1645155443. The reversal of 1645155442 is 2445515461.

It is not an unprimeable number, because it can be changed into a prime (1645155443) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 2025648 + ... + 2026459.

It is an arithmetic number, because the mean of its divisors is an integer number (182344860).

Almost surely, 2^1645155442 is an apocalyptic number.

1645155442 is a deficient number, since it is larger than the sum of its proper divisors (1272362318).

1645155442 is a wasteful number, since it uses less digits than its factorization.

1645155442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052145.

The product of its digits is 96000, while the sum is 37.

The square root of 1645155442 is about 40560.5158004678. The cubic root of 1645155442 is about 1180.5081221591.

The spelling of 1645155442 in words is "one billion, six hundred forty-five million, one hundred fifty-five thousand, four hundred forty-two".