128633425449961 has 2 divisors, whose sum is σ = 128633425449962. Its totient is φ = 128633425449960.

The previous prime is 128633425449943. The next prime is 128633425449967. The reversal of 128633425449961 is 169944524336821.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106637738168025 + 21995687281936 = 10326555^2 + 4689956^2 .

It is a cyclic number.

It is not a de Polignac number, because 128633425449961 - 2⁷ = 128633425449833 is a prime.

It is not a weakly prime, because it can be changed into another prime (128633425449967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64316712724980 + 64316712724981.

It is an arithmetic number, because the mean of its divisors is an integer number (64316712724981).

Almost surely, 2^{128633425449961} is an apocalyptic number.

It is an amenable number.

128633425449961 is a deficient number, since it is larger than the sum of its proper divisors (1).

128633425449961 is an equidigital number, since it uses as much as digits as its factorization.

128633425449961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 268738560, while the sum is 67.

The spelling of 128633425449961 in words is "one hundred twenty-eight trillion, six hundred thirty-three billion, four hundred twenty-five million, four hundred forty-nine thousand, nine hundred sixty-one".