66525647 has 2 divisors, whose sum is σ = 66525648. Its totient is φ = 66525646.

The previous prime is 66525629. The next prime is 66525649. The reversal of 66525647 is 74652566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66525647 - 2¹² = 66521551 is a prime.

Together with 66525649, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66525649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33262823 + 33262824.

It is an arithmetic number, because the mean of its divisors is an integer number (33262824).

Almost surely, 2^66525647 is an apocalyptic number.

66525647 is a deficient number, since it is larger than the sum of its proper divisors (1).

66525647 is an equidigital number, since it uses as much as digits as its factorization.

66525647 is an evil number, because the sum of its binary digits is even.

The product of its digits is 302400, while the sum is 41.

The square root of 66525647 is about 8156.3255820253. The cubic root of 66525647 is about 405.1940278450.

The spelling of 66525647 in words is "sixty-six million, five hundred twenty-five thousand, six hundred forty-seven".