66088391 has 2 divisors, whose sum is σ = 66088392. Its totient is φ = 66088390.

The previous prime is 66088381. The next prime is 66088397. The reversal of 66088391 is 19388066.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66088391 - 2¹⁴ = 66072007 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 (66088397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33044195 + 33044196.

It is an arithmetic number, because the mean of its divisors is an integer number (33044196).

Almost surely, 2^66088391 is an apocalyptic number.

66088391 is a deficient number, since it is larger than the sum of its proper divisors (1).

66088391 is an equidigital number, since it uses as much as digits as its factorization.

66088391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 66088391 is about 8129.4766744238. The cubic root of 66088391 is about 404.3043302946.

The spelling of 66088391 in words is "sixty-six million, eighty-eight thousand, three hundred ninety-one".