66669247 has 2 divisors, whose sum is σ = 66669248. Its totient is φ = 66669246.

The previous prime is 66669241. The next prime is 66669259. The reversal of 66669247 is 74296666.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66669247 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66669197 and 66669206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66669241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33334623 + 33334624.

It is an arithmetic number, because the mean of its divisors is an integer number (33334624).

Almost surely, 2^66669247 is an apocalyptic number.

66669247 is a deficient number, since it is larger than the sum of its proper divisors (1).

66669247 is an equidigital number, since it uses as much as digits as its factorization.

66669247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 46.

The square root of 66669247 is about 8165.1238202491. The cubic root of 66669247 is about 405.4853643403.

The spelling of 66669247 in words is "sixty-six million, six hundred sixty-nine thousand, two hundred forty-seven".