13630661553 has 4 divisors (see below), whose sum is σ = 18174215408. Its totient is φ = 9087107700.

The previous prime is 13630661549. The next prime is 13630661563. The reversal of 13630661553 is 35516603631.

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.

It is not a de Polignac number, because 13630661553 - 2² = 13630661549 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13630661533) 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, 2271776923 + ... + 2271776928.

It is an arithmetic number, because the mean of its divisors is an integer number (4543553852).

Almost surely, 2^13630661553 is an apocalyptic number.

It is an amenable number.

13630661553 is a deficient number, since it is larger than the sum of its proper divisors (4543553855).

13630661553 is an equidigital number, since it uses as much as digits as its factorization.

13630661553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4543553854.

The product of its (nonzero) digits is 145800, while the sum is 39.

The spelling of 13630661553 in words is "thirteen billion, six hundred thirty million, six hundred sixty-one thousand, five hundred fifty-three".