133216451261 has 2 divisors, whose sum is σ = 133216451262. Its totient is φ = 133216451260.

The previous prime is 133216451243. The next prime is 133216451317. The reversal of 133216451261 is 162154612331.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 130816039225 + 2400412036 = 361685^2 + 48994^2 .

It is a cyclic number.

It is not a de Polignac number, because 133216451261 - 2¹⁴ = 133216434877 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (133216451231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66608225630 + 66608225631.

It is an arithmetic number, because the mean of its divisors is an integer number (66608225631).

Almost surely, 2^133216451261 is an apocalyptic number.

It is an amenable number.

133216451261 is a deficient number, since it is larger than the sum of its proper divisors (1).

133216451261 is an equidigital number, since it uses as much as digits as its factorization.

133216451261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 35.

The spelling of 133216451261 in words is "one hundred thirty-three billion, two hundred sixteen million, four hundred fifty-one thousand, two hundred sixty-one".