63553453721 has 8 divisors (see below), whose sum is σ = 65086467840. Its totient is φ = 62027973568.

The previous prime is 63553453699. The next prime is 63553453753. The reversal of 63553453721 is 12735435536.

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 63553453721 - 2³⁰ = 62479711897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63553453321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1866416 + ... + 1900161.

It is an arithmetic number, because the mean of its divisors is an integer number (8135808480).

Almost surely, 2^63553453721 is an apocalyptic number.

It is an amenable number.

63553453721 is a deficient number, since it is larger than the sum of its proper divisors (1533014119).

63553453721 is a wasteful number, since it uses less digits than its factorization.

63553453721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3766983.

The product of its digits is 1134000, while the sum is 44.

The spelling of 63553453721 in words is "sixty-three billion, five hundred fifty-three million, four hundred fifty-three thousand, seven hundred twenty-one".