63942731161 has 3 divisors (see below), whose sum is σ = 63942984031. Its totient is φ = 63942478292.

The previous prime is 63942731141. The next prime is 63942731179. The reversal of 63942731161 is 16113724936.

The square root of 63942731161 is 252869.

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

63942731161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 51679383561 + 12263347600 = 227331^2 + 110740^2 .

It is not a de Polignac number, because 63942731161 - 2²⁹ = 63405860249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63942731141) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 126435 + ... + 379303.

Almost surely, 2^63942731161 is an apocalyptic number.

63942731161 is the 252869-th square number.

63942731161 is the 126435-th centered octagonal number.

It is an amenable number.

63942731161 is a deficient number, since it is larger than the sum of its proper divisors (252870).

63942731161 is an frugal number, since it uses more digits than its factorization.

63942731161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505738 (or 252869 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The spelling of 63942731161 in words is "sixty-three billion, nine hundred forty-two million, seven hundred thirty-one thousand, one hundred sixty-one".