66242851 has 2 divisors, whose sum is σ = 66242852. Its totient is φ = 66242850.

The previous prime is 66242849. The next prime is 66242861. The reversal of 66242851 is 15824266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66242851 - 2¹ = 66242849 is a prime.

Together with 66242849, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66242801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33121425 + 33121426.

It is an arithmetic number, because the mean of its divisors is an integer number (33121426).

Almost surely, 2^66242851 is an apocalyptic number.

66242851 is a deficient number, since it is larger than the sum of its proper divisors (1).

66242851 is an equidigital number, since it uses as much as digits as its factorization.

66242851 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23040, while the sum is 34.

The square root of 66242851 is about 8138.9711266228. The cubic root of 66242851 is about 404.6190616099.

The spelling of 66242851 in words is "sixty-six million, two hundred forty-two thousand, eight hundred fifty-one".