133417716521 has 2 divisors, whose sum is σ = 133417716522. Its totient is φ = 133417716520.

The previous prime is 133417716479. The next prime is 133417716533. The reversal of 133417716521 is 125617714331.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 103176506521 + 30241210000 = 321211^2 + 173900^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-133417716521 is a prime.

It is not a weakly prime, because it can be changed into another prime (133417716581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66708858260 + 66708858261.

It is an arithmetic number, because the mean of its divisors is an integer number (66708858261).

Almost surely, 2^133417716521 is an apocalyptic number.

It is an amenable number.

133417716521 is a deficient number, since it is larger than the sum of its proper divisors (1).

133417716521 is an equidigital number, since it uses as much as digits as its factorization.

133417716521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The spelling of 133417716521 in words is "one hundred thirty-three billion, four hundred seventeen million, seven hundred sixteen thousand, five hundred twenty-one".