634447534549 has 2 divisors, whose sum is σ = 634447534550. Its totient is φ = 634447534548.

The previous prime is 634447534459. The next prime is 634447534559. The reversal of 634447534549 is 945435744436.

Together with previous prime (634447534459) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 353854850449 + 280592684100 = 594857^2 + 529710^2 .

It is a cyclic number.

It is not a de Polignac number, because 634447534549 - 2⁷ = 634447534421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 634447534493 and 634447534502.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (634447534559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 317223767274 + 317223767275.

It is an arithmetic number, because the mean of its divisors is an integer number (317223767275).

Almost surely, 2^634447534549 is an apocalyptic number.

It is an amenable number.

634447534549 is a deficient number, since it is larger than the sum of its proper divisors (1).

634447534549 is an equidigital number, since it uses as much as digits as its factorization.

634447534549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87091200, while the sum is 58.

The spelling of 634447534549 in words is "six hundred thirty-four billion, four hundred forty-seven million, five hundred thirty-four thousand, five hundred forty-nine".