1663556433 has 16 divisors (see below), whose sum is σ = 2765392896. Its totient is φ = 864185040.

The previous prime is 1663556429. The next prime is 1663556473. The reversal of 1663556433 is 3346553661.

It is not a de Polignac number, because 1663556433 - 2² = 1663556429 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1663556473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3600541 + ... + 3601002.

It is an arithmetic number, because the mean of its divisors is an integer number (172837056).

Almost surely, 2^1663556433 is an apocalyptic number.

It is an amenable number.

1663556433 is a deficient number, since it is larger than the sum of its proper divisors (1101836463).

1663556433 is a wasteful number, since it uses less digits than its factorization.

1663556433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7201564.

The product of its digits is 583200, while the sum is 42.

The square root of 1663556433 is about 40786.7188310116. The cubic root of 1663556433 is about 1184.8931242962.

It can be divided in two parts, 1663 and 556433, that added together give a triangular number (558096 = T₁₀₅₆).

The spelling of 1663556433 in words is "one billion, six hundred sixty-three million, five hundred fifty-six thousand, four hundred thirty-three".