66047801 has 2 divisors, whose sum is σ = 66047802. Its totient is φ = 66047800.

The previous prime is 66047791. The next prime is 66047803. The reversal of 66047801 is 10874066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62789776 + 3258025 = 7924^2 + 1805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66047801 is a prime.

Together with 66047803, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66047803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33023900 + 33023901.

It is an arithmetic number, because the mean of its divisors is an integer number (33023901).

Almost surely, 2^66047801 is an apocalyptic number.

It is an amenable number.

66047801 is a deficient number, since it is larger than the sum of its proper divisors (1).

66047801 is an equidigital number, since it uses as much as digits as its factorization.

66047801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 66047801 is about 8126.9798203269. The cubic root of 66047801 is about 404.2215418081.

The spelling of 66047801 in words is "sixty-six million, forty-seven thousand, eight hundred one".