634474910561 has 2 divisors, whose sum is σ = 634474910562. Its totient is φ = 634474910560.

The previous prime is 634474910473. The next prime is 634474910581. The reversal of 634474910561 is 165019474436.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 360757598161 + 273717312400 = 600631^2 + 523180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-634474910561 is a prime.

It is not a weakly prime, because it can be changed into another prime (634474910581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317237455280 + 317237455281.

It is an arithmetic number, because the mean of its divisors is an integer number (317237455281).

Almost surely, 2^634474910561 is an apocalyptic number.

It is an amenable number.

634474910561 is a deficient number, since it is larger than the sum of its proper divisors (1).

634474910561 is an equidigital number, since it uses as much as digits as its factorization.

634474910561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 634474910561 in words is "six hundred thirty-four billion, four hundred seventy-four million, nine hundred ten thousand, five hundred sixty-one".