1643142866 has 8 divisors (see below), whose sum is σ = 2494409904. Its totient is φ = 811672900.

The previous prime is 1643142821. The next prime is 1643142869. The reversal of 1643142866 is 6682413461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1643142869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4949060 + ... + 4949391.

It is an arithmetic number, because the mean of its divisors is an integer number (311801238).

Almost surely, 2^1643142866 is an apocalyptic number.

1643142866 is a deficient number, since it is larger than the sum of its proper divisors (851267038).

1643142866 is an equidigital number, since it uses as much as digits as its factorization.

1643142866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9898536.

The product of its digits is 165888, while the sum is 41.

The square root of 1643142866 is about 40535.6986617969. The cubic root of 1643142866 is about 1180.0265401481.

The spelling of 1643142866 in words is "one billion, six hundred forty-three million, one hundred forty-two thousand, eight hundred sixty-six".