66242357 has 2 divisors, whose sum is σ = 66242358. Its totient is φ = 66242356.

The previous prime is 66242333. The next prime is 66242359. The reversal of 66242357 is 75324266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47872561 + 18369796 = 6919^2 + 4286^2 .

It is a cyclic number.

It is not a de Polignac number, because 66242357 - 2¹⁶ = 66176821 is a prime.

Together with 66242359, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66242359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33121178 + 33121179.

It is an arithmetic number, because the mean of its divisors is an integer number (33121179).

Almost surely, 2^66242357 is an apocalyptic number.

It is an amenable number.

66242357 is a deficient number, since it is larger than the sum of its proper divisors (1).

66242357 is an equidigital number, since it uses as much as digits as its factorization.

66242357 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 35.

The square root of 66242357 is about 8138.9407787500. The cubic root of 66242357 is about 404.6180558042.

The spelling of 66242357 in words is "sixty-six million, two hundred forty-two thousand, three hundred fifty-seven".