1653638663 has 4 divisors (see below), whose sum is σ = 1653869208. Its totient is φ = 1653408120.

The previous prime is 1653638653. The next prime is 1653638677. The reversal of 1653638663 is 3668363561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3668363561 = 157 ⋅23365373.

It is a cyclic number.

It is not a de Polignac number, because 1653638663 - 2⁸ = 1653638407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1653638633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104156 + ... + 118977.

It is an arithmetic number, because the mean of its divisors is an integer number (413467302).

Almost surely, 2^1653638663 is an apocalyptic number.

1653638663 is a deficient number, since it is larger than the sum of its proper divisors (230545).

1653638663 is an equidigital number, since it uses as much as digits as its factorization.

1653638663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230544.

The product of its digits is 1399680, while the sum is 47.

The square root of 1653638663 is about 40664.9562030995. The cubic root of 1653638663 is about 1182.5337356564.

The spelling of 1653638663 in words is "one billion, six hundred fifty-three million, six hundred thirty-eight thousand, six hundred sixty-three".