63641260861 has 2 divisors, whose sum is σ = 63641260862. Its totient is φ = 63641260860.

The previous prime is 63641260853. The next prime is 63641260909. The reversal of 63641260861 is 16806214636.

It is a happy number.

63641260861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63569536900 + 71723961 = 252130^2 + 8469^2 .

It is a cyclic number.

It is not a de Polignac number, because 63641260861 - 2³ = 63641260853 is a prime.

It is a super-2 number, since 2×63641260861² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63641260831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31820630430 + 31820630431.

It is an arithmetic number, because the mean of its divisors is an integer number (31820630431).

Almost surely, 2^63641260861 is an apocalyptic number.

It is an amenable number.

63641260861 is a deficient number, since it is larger than the sum of its proper divisors (1).

63641260861 is an equidigital number, since it uses as much as digits as its factorization.

63641260861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 43.

The spelling of 63641260861 in words is "sixty-three billion, six hundred forty-one million, two hundred sixty thousand, eight hundred sixty-one".