66525541 has 2 divisors, whose sum is σ = 66525542. Its totient is φ = 66525540.

The previous prime is 66525523. The next prime is 66525553. The reversal of 66525541 is 14552566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66422500 + 103041 = 8150^2 + 321^2 .

It is a cyclic number.

It is not a de Polignac number, because 66525541 - 2¹¹ = 66523493 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66525497 and 66525506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66525241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33262770 + 33262771.

It is an arithmetic number, because the mean of its divisors is an integer number (33262771).

Almost surely, 2^66525541 is an apocalyptic number.

It is an amenable number.

66525541 is a deficient number, since it is larger than the sum of its proper divisors (1).

66525541 is an equidigital number, since it uses as much as digits as its factorization.

66525541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36000, while the sum is 34.

The square root of 66525541 is about 8156.3190839986. The cubic root of 66525541 is about 405.1938126368.

The spelling of 66525541 in words is "sixty-six million, five hundred twenty-five thousand, five hundred forty-one".