66060391 has 2 divisors, whose sum is σ = 66060392. Its totient is φ = 66060390.

The previous prime is 66060383. The next prime is 66060433. The reversal of 66060391 is 19306066.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66060391 - 2³ = 66060383 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66060311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33030195 + 33030196.

It is an arithmetic number, because the mean of its divisors is an integer number (33030196).

Almost surely, 2^66060391 is an apocalyptic number.

66060391 is a deficient number, since it is larger than the sum of its proper divisors (1).

66060391 is an equidigital number, since it uses as much as digits as its factorization.

66060391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 31.

The square root of 66060391 is about 8127.7543639064. The cubic root of 66060391 is about 404.2472243481.

The spelling of 66060391 in words is "sixty-six million, sixty thousand, three hundred ninety-one".