133661221249 has 2 divisors, whose sum is σ = 133661221250. Its totient is φ = 133661221248.

The previous prime is 133661221231. The next prime is 133661221283. The reversal of 133661221249 is 942122166331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92533381249 + 41127840000 = 304193^2 + 202800^2 .

It is a cyclic number.

It is not a de Polignac number, because 133661221249 - 2²³ = 133652832641 is a prime.

It is not a weakly prime, because it can be changed into another prime (133661221219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66830610624 + 66830610625.

It is an arithmetic number, because the mean of its divisors is an integer number (66830610625).

Almost surely, 2^133661221249 is an apocalyptic number.

It is an amenable number.

133661221249 is a deficient number, since it is larger than the sum of its proper divisors (1).

133661221249 is an equidigital number, since it uses as much as digits as its factorization.

133661221249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The spelling of 133661221249 in words is "one hundred thirty-three billion, six hundred sixty-one million, two hundred twenty-one thousand, two hundred forty-nine".