125221166449 has 2 divisors, whose sum is σ = 125221166450. Its totient is φ = 125221166448.

The previous prime is 125221166393. The next prime is 125221166479. The reversal of 125221166449 is 944661122521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122013983025 + 3207183424 = 349305^2 + 56632^2 .

It is a cyclic number.

It is not a de Polignac number, because 125221166449 - 2¹⁹ = 125220642161 is a prime.

It is not a weakly prime, because it can be changed into another prime (125221166479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62610583224 + 62610583225.

It is an arithmetic number, because the mean of its divisors is an integer number (62610583225).

Almost surely, 2^125221166449 is an apocalyptic number.

It is an amenable number.

125221166449 is a deficient number, since it is larger than the sum of its proper divisors (1).

125221166449 is an equidigital number, since it uses as much as digits as its factorization.

125221166449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The spelling of 125221166449 in words is "one hundred twenty-five billion, two hundred twenty-one million, one hundred sixty-six thousand, four hundred forty-nine".