63779723561 has 2 divisors, whose sum is σ = 63779723562. Its totient is φ = 63779723560.

The previous prime is 63779723521. The next prime is 63779723569. The reversal of 63779723561 is 16532797736.

63779723561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56867463961 + 6912259600 = 238469^2 + 83140^2 .

It is a cyclic number.

It is not a de Polignac number, because 63779723561 - 2¹⁰ = 63779722537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 63779723497 and 63779723506.

It is not a weakly prime, because it can be changed into another prime (63779723569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31889861780 + 31889861781.

It is an arithmetic number, because the mean of its divisors is an integer number (31889861781).

Almost surely, 2^63779723561 is an apocalyptic number.

It is an amenable number.

63779723561 is a deficient number, since it is larger than the sum of its proper divisors (1).

63779723561 is an equidigital number, since it uses as much as digits as its factorization.

63779723561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10001880, while the sum is 56.

The spelling of 63779723561 in words is "sixty-three billion, seven hundred seventy-nine million, seven hundred twenty-three thousand, five hundred sixty-one".