63549872281 has 9 divisors (see below), whose sum is σ = 73927414431. Its totient is φ = 54469806552.

The previous prime is 63549872257. The next prime is 63549872369. The reversal of 63549872281 is 18227894536.

The square root of 63549872281 is 252091.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 27860617225 + 35689255056 = 166915^2 + 188916^2 .

It is not a de Polignac number, because 63549872281 - 2⁷ = 63549872153 is a prime.

It is a super-2 number, since 2×63549872281² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63549875281) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1746631 + ... + 1782643.

It is an arithmetic number, because the mean of its divisors is an integer number (8214157159).

Almost surely, 2^63549872281 is an apocalyptic number.

63549872281 is the 252091-st square number.

63549872281 is the 126046-th centered octagonal number.

It is an amenable number.

63549872281 is a deficient number, since it is larger than the sum of its proper divisors (10377542150).

63549872281 is an frugal number, since it uses more digits than its factorization.

63549872281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72040 (or 36020 counting only the distinct ones).

The product of its digits is 5806080, while the sum is 55.

The spelling of 63549872281 in words is "sixty-three billion, five hundred forty-nine million, eight hundred seventy-two thousand, two hundred eighty-one".