1663542433 has 4 divisors (see below), whose sum is σ = 1901191360. Its totient is φ = 1425893508.

The previous prime is 1663542431. The next prime is 1663542437. The reversal of 1663542433 is 3342453661.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3342453661 = 39749 ⋅84089.

It is a cyclic number.

It is not a de Polignac number, because 1663542433 - 2¹ = 1663542431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1663542392 and 1663542401.

It is not an unprimeable number, because it can be changed into a prime (1663542431) 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, 118824453 + ... + 118824466.

It is an arithmetic number, because the mean of its divisors is an integer number (475297840).

Almost surely, 2^1663542433 is an apocalyptic number.

It is an amenable number.

1663542433 is a deficient number, since it is larger than the sum of its proper divisors (237648927).

1663542433 is an equidigital number, since it uses as much as digits as its factorization.

1663542433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237648926.

The product of its digits is 155520, while the sum is 37.

The square root of 1663542433 is about 40786.5472061561. The cubic root of 1663542433 is about 1184.8898003833.

The spelling of 1663542433 in words is "one billion, six hundred sixty-three million, five hundred forty-two thousand, four hundred thirty-three".