1643315642 has 16 divisors (see below), whose sum is σ = 2694166272. Its totient is φ = 748378560.

The previous prime is 1643315623. The next prime is 1643315651. The reversal of 1643315642 is 2465133461.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 778508 + ... + 780615.

It is an arithmetic number, because the mean of its divisors is an integer number (168385392).

Almost surely, 2^1643315642 is an apocalyptic number.

1643315642 is a deficient number, since it is larger than the sum of its proper divisors (1050850630).

1643315642 is a wasteful number, since it uses less digits than its factorization.

1643315642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1559173.

The product of its digits is 51840, while the sum is 35.

The square root of 1643315642 is about 40537.8297643078. The cubic root of 1643315642 is about 1180.0678985156.

The spelling of 1643315642 in words is "one billion, six hundred forty-three million, three hundred fifteen thousand, six hundred forty-two".