63728713553 has 2 divisors, whose sum is σ = 63728713554. Its totient is φ = 63728713552.

The previous prime is 63728713519. The next prime is 63728713571. The reversal of 63728713553 is 35531782736.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54071131024 + 9657582529 = 232532^2 + 98273^2 .

It is a cyclic number.

It is not a de Polignac number, because 63728713553 - 2²⁶ = 63661604689 is a prime.

It is a super-2 number, since 2×63728713553² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63728713253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31864356776 + 31864356777.

It is an arithmetic number, because the mean of its divisors is an integer number (31864356777).

Almost surely, 2^63728713553 is an apocalyptic number.

It is an amenable number.

63728713553 is a deficient number, since it is larger than the sum of its proper divisors (1).

63728713553 is an equidigital number, since it uses as much as digits as its factorization.

63728713553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3175200, while the sum is 50.

The spelling of 63728713553 in words is "sixty-three billion, seven hundred twenty-eight million, seven hundred thirteen thousand, five hundred fifty-three".