197339366509 has 2 divisors, whose sum is σ = 197339366510. Its totient is φ = 197339366508.

The previous prime is 197339366501. The next prime is 197339366513. The reversal of 197339366509 is 905663933791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 191922848100 + 5416518409 = 438090^2 + 73597^2 .

It is a cyclic number.

It is not a de Polignac number, because 197339366509 - 2³ = 197339366501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197339366501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98669683254 + 98669683255.

It is an arithmetic number, because the mean of its divisors is an integer number (98669683255).

Almost surely, 2^197339366509 is an apocalyptic number.

It is an amenable number.

197339366509 is a deficient number, since it is larger than the sum of its proper divisors (1).

197339366509 is an equidigital number, since it uses as much as digits as its factorization.

197339366509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24800580, while the sum is 61.

The spelling of 197339366509 in words is "one hundred ninety-seven billion, three hundred thirty-nine million, three hundred sixty-six thousand, five hundred nine".