197805133873 has 2 divisors, whose sum is σ = 197805133874. Its totient is φ = 197805133872.

The previous prime is 197805133703. The next prime is 197805133907. The reversal of 197805133873 is 378331508791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 178344046864 + 19461087009 = 422308^2 + 139503^2 .

It is an emirp because it is prime and its reverse (378331508791) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 197805133873 - 2²¹ = 197803036721 is a prime.

It is not a weakly prime, because it can be changed into another prime (197805833873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98902566936 + 98902566937.

It is an arithmetic number, because the mean of its divisors is an integer number (98902566937).

Almost surely, 2^197805133873 is an apocalyptic number.

It is an amenable number.

197805133873 is a deficient number, since it is larger than the sum of its proper divisors (1).

197805133873 is an equidigital number, since it uses as much as digits as its factorization.

197805133873 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The spelling of 197805133873 in words is "one hundred ninety-seven billion, eight hundred five million, one hundred thirty-three thousand, eight hundred seventy-three".