667449889397 has 2 divisors, whose sum is σ = 667449889398. Its totient is φ = 667449889396.

The previous prime is 667449889369. The next prime is 667449889409. The reversal of 667449889397 is 793988944766.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 645115782481 + 22334106916 = 803191^2 + 149446^2 .

It is a cyclic number.

It is not a de Polignac number, because 667449889397 - 2²⁸ = 667181453941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (667449889097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 333724944698 + 333724944699.

It is an arithmetic number, because the mean of its divisors is an integer number (333724944699).

Almost surely, 2^667449889397 is an apocalyptic number.

It is an amenable number.

667449889397 is a deficient number, since it is larger than the sum of its proper divisors (1).

667449889397 is an equidigital number, since it uses as much as digits as its factorization.

667449889397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3950456832, while the sum is 80.

The spelling of 667449889397 in words is "six hundred sixty-seven billion, four hundred forty-nine million, eight hundred eighty-nine thousand, three hundred ninety-seven".