133572605521 has 2 divisors, whose sum is σ = 133572605522. Its totient is φ = 133572605520.

The previous prime is 133572605407. The next prime is 133572605549. The reversal of 133572605521 is 125506275331.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87450318400 + 46122287121 = 295720^2 + 214761^2 .

It is a cyclic number.

It is not a de Polignac number, because 133572605521 - 2⁹ = 133572605009 is a prime.

It is not a weakly prime, because it can be changed into another prime (133572605561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66786302760 + 66786302761.

It is an arithmetic number, because the mean of its divisors is an integer number (66786302761).

Almost surely, 2^133572605521 is an apocalyptic number.

It is an amenable number.

133572605521 is a deficient number, since it is larger than the sum of its proper divisors (1).

133572605521 is an equidigital number, since it uses as much as digits as its factorization.

133572605521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189000, while the sum is 40.

The spelling of 133572605521 in words is "one hundred thirty-three billion, five hundred seventy-two million, six hundred five thousand, five hundred twenty-one".