66825529 has 2 divisors, whose sum is σ = 66825530. Its totient is φ = 66825528.

The previous prime is 66825523. The next prime is 66825559. The reversal of 66825529 is 92552866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65237929 + 1587600 = 8077^2 + 1260^2 .

It is a cyclic number.

It is not a de Polignac number, because 66825529 - 2⁵ = 66825497 is a prime.

It is a super-2 number, since 2×66825529² = 8931302652259682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66825523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33412764 + 33412765.

It is an arithmetic number, because the mean of its divisors is an integer number (33412765).

Almost surely, 2^66825529 is an apocalyptic number.

It is an amenable number.

66825529 is a deficient number, since it is larger than the sum of its proper divisors (1).

66825529 is an equidigital number, since it uses as much as digits as its factorization.

66825529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 43.

The square root of 66825529 is about 8174.6883121010. The cubic root of 66825529 is about 405.8019551466.

The spelling of 66825529 in words is "sixty-six million, eight hundred twenty-five thousand, five hundred twenty-nine".