1663736533 has 8 divisors (see below), whose sum is σ = 1747728000. Its totient is φ = 1580716368.

The previous prime is 1663736507. The next prime is 1663736537. The reversal of 1663736533 is 3356373661.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1663736533 - 2²⁵ = 1630182101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1663736533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1663736537) 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, 239313 + ... + 246166.

It is an arithmetic number, because the mean of its divisors is an integer number (218466000).

Almost surely, 2^1663736533 is an apocalyptic number.

It is an amenable number.

1663736533 is a deficient number, since it is larger than the sum of its proper divisors (83991467).

1663736533 is a wasteful number, since it uses less digits than its factorization.

1663736533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485651.

The product of its digits is 612360, while the sum is 43.

The square root of 1663736533 is about 40788.9265977912. The cubic root of 1663736533 is about 1184.9358823991.

The spelling of 1663736533 in words is "one billion, six hundred sixty-three million, seven hundred thirty-six thousand, five hundred thirty-three".