1664813842 has 16 divisors (see below), whose sum is σ = 2663146080. Its totient is φ = 777803328.

The previous prime is 1664813833. The next prime is 1664813849. The reversal of 1664813842 is 2483184661.

It is not an unprimeable number, because it can be changed into a prime (1664813849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171408 + ... + 180859.

It is an arithmetic number, because the mean of its divisors is an integer number (166446630).

Almost surely, 2^1664813842 is an apocalyptic number.

1664813842 is a deficient number, since it is larger than the sum of its proper divisors (998332238).

1664813842 is a wasteful number, since it uses less digits than its factorization.

1664813842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352425.

The product of its digits is 221184, while the sum is 43.

The square root of 1664813842 is about 40802.1303610486. The cubic root of 1664813842 is about 1185.1915852770.

The spelling of 1664813842 in words is "one billion, six hundred sixty-four million, eight hundred thirteen thousand, eight hundred forty-two".