63681553 has 8 divisors (see below), whose sum is σ = 68779368. Its totient is φ = 58612224.

The previous prime is 63681539. The next prime is 63681571. The reversal of 63681553 is 35518636.

63681553 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 685584 + 62995969 = 828^2 + 7937^2 .

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 63681553 - 2⁹ = 63681041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63681523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2350 + ... + 11527.

It is an arithmetic number, because the mean of its divisors is an integer number (8597421).

Almost surely, 2^63681553 is an apocalyptic number.

It is an amenable number.

63681553 is a deficient number, since it is larger than the sum of its proper divisors (5097815).

63681553 is a wasteful number, since it uses less digits than its factorization.

63681553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14243.

The product of its digits is 64800, while the sum is 37.

The square root of 63681553 is about 7980.0722427808. The cubic root of 63681553 is about 399.3354653456.

It can be divided in two parts, 6368 and 1553, that added together give a square (7921 = 89²).

The spelling of 63681553 in words is "sixty-three million, six hundred eighty-one thousand, five hundred fifty-three".