398266185497 has 2 divisors, whose sum is σ = 398266185498. Its totient is φ = 398266185496.

The previous prime is 398266185479. The next prime is 398266185539. The reversal of 398266185497 is 794581662893.

Together with previous prime (398266185479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 211396728841 + 186869456656 = 459779^2 + 432284^2 .

It is a cyclic number.

It is not a de Polignac number, because 398266185497 - 2¹⁰ = 398266184473 is a prime.

It is not a weakly prime, because it can be changed into another prime (398266185797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199133092748 + 199133092749.

It is an arithmetic number, because the mean of its divisors is an integer number (199133092749).

Almost surely, 2^398266185497 is an apocalyptic number.

It is an amenable number.

398266185497 is a deficient number, since it is larger than the sum of its proper divisors (1).

398266185497 is an equidigital number, since it uses as much as digits as its factorization.

398266185497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156764160, while the sum is 68.

The spelling of 398266185497 in words is "three hundred ninety-eight billion, two hundred sixty-six million, one hundred eighty-five thousand, four hundred ninety-seven".