198611125457 has 2 divisors, whose sum is σ = 198611125458. Its totient is φ = 198611125456.

The previous prime is 198611125387. The next prime is 198611125459. The reversal of 198611125457 is 754521116891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 193064450881 + 5546674576 = 439391^2 + 74476^2 .

It is an emirp because it is prime and its reverse (754521116891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 198611125457 - 2¹⁰ = 198611124433 is a prime.

Together with 198611125459, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (198611125459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99305562728 + 99305562729.

It is an arithmetic number, because the mean of its divisors is an integer number (99305562729).

Almost surely, 2^198611125457 is an apocalyptic number.

It is an amenable number.

198611125457 is a deficient number, since it is larger than the sum of its proper divisors (1).

198611125457 is an equidigital number, since it uses as much as digits as its factorization.

198611125457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 50.

The spelling of 198611125457 in words is "one hundred ninety-eight billion, six hundred eleven million, one hundred twenty-five thousand, four hundred fifty-seven".