667210242557 has 2 divisors, whose sum is σ = 667210242558. Its totient is φ = 667210242556.

The previous prime is 667210242487. The next prime is 667210242571. The reversal of 667210242557 is 755242012766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 355733516356 + 311476726201 = 596434^2 + 558101^2 .

It is a cyclic number.

It is not a de Polignac number, because 667210242557 - 2²² = 667206048253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667210244557) 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, 333605121278 + 333605121279.

It is an arithmetic number, because the mean of its divisors is an integer number (333605121279).

Almost surely, 2^667210242557 is an apocalyptic number.

It is an amenable number.

667210242557 is a deficient number, since it is larger than the sum of its proper divisors (1).

667210242557 is an equidigital number, since it uses as much as digits as its factorization.

667210242557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1411200, while the sum is 47.

The spelling of 667210242557 in words is "six hundred sixty-seven billion, two hundred ten million, two hundred forty-two thousand, five hundred fifty-seven".