66573239 has 2 divisors, whose sum is σ = 66573240. Its totient is φ = 66573238.

The previous prime is 66573233. The next prime is 66573263. The reversal of 66573239 is 93237566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66573239 - 2⁴ = 66573223 is a prime.

It is a super-2 number, since 2×66573239² = 8863992301902242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 66573196 and 66573205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66573233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33286619 + 33286620.

It is an arithmetic number, because the mean of its divisors is an integer number (33286620).

Almost surely, 2^66573239 is an apocalyptic number.

66573239 is a deficient number, since it is larger than the sum of its proper divisors (1).

66573239 is an equidigital number, since it uses as much as digits as its factorization.

66573239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 204120, while the sum is 41.

The square root of 66573239 is about 8159.2425506293. The cubic root of 66573239 is about 405.2906291726.

The spelling of 66573239 in words is "sixty-six million, five hundred seventy-three thousand, two hundred thirty-nine".