1663404833 has 4 divisors (see below), whose sum is σ = 1664610708. Its totient is φ = 1662198960.

The previous prime is 1663404829. The next prime is 1663404839. The reversal of 1663404833 is 3384043661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3384043661 = 15361 ⋅220301.

It can be written as a sum of positive squares in 2 ways, for example, as 432307264 + 1231097569 = 20792^2 + 35087^2 .

It is a cyclic number.

It is not a de Polignac number, because 1663404833 - 2² = 1663404829 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1663404839) 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 3 ways as a sum of consecutive naturals, for example, 600866 + ... + 603627.

It is an arithmetic number, because the mean of its divisors is an integer number (416152677).

Almost surely, 2^1663404833 is an apocalyptic number.

It is an amenable number.

1663404833 is a deficient number, since it is larger than the sum of its proper divisors (1205875).

1663404833 is a wasteful number, since it uses less digits than its factorization.

1663404833 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1205874.

The product of its (nonzero) digits is 124416, while the sum is 38.

The square root of 1663404833 is about 40784.8603405725. The cubic root of 1663404833 is about 1184.8571300751.

The spelling of 1663404833 in words is "one billion, six hundred sixty-three million, four hundred four thousand, eight hundred thirty-three".