63946777129 has 3 divisors (see below), whose sum is σ = 63947030007. Its totient is φ = 63946524252.

The previous prime is 63946777127. The next prime is 63946777151. The reversal of 63946777129 is 92177764936.

The square root of 63946777129 is 252877.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 32918659225 + 31028117904 = 181435^2 + 176148^2 .

It is not a de Polignac number, because 63946777129 - 2¹ = 63946777127 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63946777123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 126439 + ... + 379315.

It is an arithmetic number, because the mean of its divisors is an integer number (21315676669).

Almost surely, 2^63946777129 is an apocalyptic number.

63946777129 is the 252877-th square number.

63946777129 is the 126439-th centered octagonal number.

It is an amenable number.

63946777129 is a deficient number, since it is larger than the sum of its proper divisors (252878).

63946777129 is an frugal number, since it uses more digits than its factorization.

63946777129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505754 (or 252877 counting only the distinct ones).

The product of its digits is 24004512, while the sum is 61.

The spelling of 63946777129 in words is "sixty-three billion, nine hundred forty-six million, seven hundred seventy-seven thousand, one hundred twenty-nine".