63701612561 has 2 divisors, whose sum is σ = 63701612562. Its totient is φ = 63701612560.

The previous prime is 63701612497. The next prime is 63701612587. The reversal of 63701612561 is 16521610736.

63701612561 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., 63068788225 + 632824336 = 251135^2 + 25156^2 .

It is a cyclic number.

It is not a de Polignac number, because 63701612561 - 2⁶ = 63701612497 is a prime.

It is not a weakly prime, because it can be changed into another prime (63703612561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31850806280 + 31850806281.

It is an arithmetic number, because the mean of its divisors is an integer number (31850806281).

Almost surely, 2^63701612561 is an apocalyptic number.

It is an amenable number.

63701612561 is a deficient number, since it is larger than the sum of its proper divisors (1).

63701612561 is an equidigital number, since it uses as much as digits as its factorization.

63701612561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 38.

The spelling of 63701612561 in words is "sixty-three billion, seven hundred one million, six hundred twelve thousand, five hundred sixty-one".