66725567 has 2 divisors, whose sum is σ = 66725568. Its totient is φ = 66725566.

The previous prime is 66725539. The next prime is 66725579. The reversal of 66725567 is 76552766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66725567 - 2²⁴ = 49948351 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66725537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33362783 + 33362784.

It is an arithmetic number, because the mean of its divisors is an integer number (33362784).

Almost surely, 2^66725567 is an apocalyptic number.

66725567 is a deficient number, since it is larger than the sum of its proper divisors (1).

66725567 is an equidigital number, since it uses as much as digits as its factorization.

66725567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 44.

The square root of 66725567 is about 8168.5719070104. The cubic root of 66725567 is about 405.5995124627.

The spelling of 66725567 in words is "sixty-six million, seven hundred twenty-five thousand, five hundred sixty-seven".