671548208257 has 2 divisors, whose sum is σ = 671548208258. Its totient is φ = 671548208256.

The previous prime is 671548208197. The next prime is 671548208263. The reversal of 671548208257 is 752802845176.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 454600926081 + 216947282176 = 674241^2 + 465776^2 .

It is a cyclic number.

It is not a de Polignac number, because 671548208257 - 2¹⁹ = 671547683969 is a prime.

It is a super-3 number, since 3×671548208257³ (a number of 36 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 671548208198 and 671548208207.

It is not a weakly prime, because it can be changed into another prime (671548208267) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 335774104128 + 335774104129.

It is an arithmetic number, because the mean of its divisors is an integer number (335774104129).

Almost surely, 2^671548208257 is an apocalyptic number.

It is an amenable number.

671548208257 is a deficient number, since it is larger than the sum of its proper divisors (1).

671548208257 is an equidigital number, since it uses as much as digits as its factorization.

671548208257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7526400, while the sum is 55.

The spelling of 671548208257 in words is "six hundred seventy-one billion, five hundred forty-eight million, two hundred eight thousand, two hundred fifty-seven".