66347873 has 2 divisors, whose sum is σ = 66347874. Its totient is φ = 66347872.

The previous prime is 66347863. The next prime is 66347899. The reversal of 66347873 is 37874366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44182609 + 22165264 = 6647^2 + 4708^2 .

It is a cyclic number.

It is not a de Polignac number, because 66347873 - 2⁴ = 66347857 is a prime.

It is not a weakly prime, because it can be changed into another prime (66347833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33173936 + 33173937.

It is an arithmetic number, because the mean of its divisors is an integer number (33173937).

Almost surely, 2^66347873 is an apocalyptic number.

It is an amenable number.

66347873 is a deficient number, since it is larger than the sum of its proper divisors (1).

66347873 is an equidigital number, since it uses as much as digits as its factorization.

66347873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 44.

The square root of 66347873 is about 8145.4203697538. The cubic root of 66347873 is about 404.8327775831.

The spelling of 66347873 in words is "sixty-six million, three hundred forty-seven thousand, eight hundred seventy-three".