66847901 has 2 divisors, whose sum is σ = 66847902. Its totient is φ = 66847900.

The previous prime is 66847883. The next prime is 66847919. The reversal of 66847901 is 10974866.

It is a balanced prime because it is at equal distance from previous prime (66847883) and next prime (66847919).

It can be written as a sum of positive squares in only one way, i.e., 39075001 + 27772900 = 6251^2 + 5270^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66847901 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 (66847981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33423950 + 33423951.

It is an arithmetic number, because the mean of its divisors is an integer number (33423951).

Almost surely, 2^66847901 is an apocalyptic number.

It is an amenable number.

66847901 is a deficient number, since it is larger than the sum of its proper divisors (1).

66847901 is an equidigital number, since it uses as much as digits as its factorization.

66847901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 66847901 is about 8176.0565678082. The cubic root of 66847901 is about 405.8472351893.

The spelling of 66847901 in words is "sixty-six million, eight hundred forty-seven thousand, nine hundred one".