961559456657 has 2 divisors, whose sum is σ = 961559456658. Its totient is φ = 961559456656.

The previous prime is 961559456573. The next prime is 961559456771. The reversal of 961559456657 is 756654955169.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 487170496576 + 474388960081 = 697976^2 + 688759^2 .

It is a cyclic number.

It is not a de Polignac number, because 961559456657 - 2¹² = 961559452561 is a prime.

It is not a weakly prime, because it can be changed into another prime (961559456857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 480779728328 + 480779728329.

It is an arithmetic number, because the mean of its divisors is an integer number (480779728329).

Almost surely, 2^961559456657 is an apocalyptic number.

It is an amenable number.

961559456657 is a deficient number, since it is larger than the sum of its proper divisors (1).

961559456657 is an equidigital number, since it uses as much as digits as its factorization.

961559456657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180000, while the sum is 68.

The spelling of 961559456657 in words is "nine hundred sixty-one billion, five hundred fifty-nine million, four hundred fifty-six thousand, six hundred fifty-seven".