668050175549 has 2 divisors, whose sum is σ = 668050175550. Its totient is φ = 668050175548.

The previous prime is 668050175543. The next prime is 668050175557. The reversal of 668050175549 is 945571050866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 658516020100 + 9534155449 = 811490^2 + 97643^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-668050175549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 668050175494 and 668050175503.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (668050175543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 334025087774 + 334025087775.

It is an arithmetic number, because the mean of its divisors is an integer number (334025087775).

Almost surely, 2^668050175549 is an apocalyptic number.

It is an amenable number.

668050175549 is a deficient number, since it is larger than the sum of its proper divisors (1).

668050175549 is an equidigital number, since it uses as much as digits as its factorization.

668050175549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072000, while the sum is 56.

The spelling of 668050175549 in words is "six hundred sixty-eight billion, fifty million, one hundred seventy-five thousand, five hundred forty-nine".