66157211 has 2 divisors, whose sum is σ = 66157212. Its totient is φ = 66157210.

The previous prime is 66157181. The next prime is 66157229. The reversal of 66157211 is 11275166.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66157211 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66157241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33078605 + 33078606.

It is an arithmetic number, because the mean of its divisors is an integer number (33078606).

Almost surely, 2^66157211 is an apocalyptic number.

66157211 is a deficient number, since it is larger than the sum of its proper divisors (1).

66157211 is an equidigital number, since it uses as much as digits as its factorization.

66157211 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2520, while the sum is 29.

The square root of 66157211 is about 8133.7083178585. The cubic root of 66157211 is about 404.4446200444. Note that the first 3 decimals are identical.

The spelling of 66157211 in words is "sixty-six million, one hundred fifty-seven thousand, two hundred eleven".