66398747 has 2 divisors, whose sum is σ = 66398748. Its totient is φ = 66398746.

The previous prime is 66398737. The next prime is 66398819. The reversal of 66398747 is 74789366.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66398747 - 2¹² = 66394651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66398695 and 66398704.

It is not a weakly prime, because it can be changed into another prime (66398737) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33199373 + 33199374.

It is an arithmetic number, because the mean of its divisors is an integer number (33199374).

Almost surely, 2^66398747 is an apocalyptic number.

66398747 is a deficient number, since it is larger than the sum of its proper divisors (1).

66398747 is an equidigital number, since it uses as much as digits as its factorization.

66398747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 50.

The square root of 66398747 is about 8148.5426304340. The cubic root of 66398747 is about 404.9362232552.

The spelling of 66398747 in words is "sixty-six million, three hundred ninety-eight thousand, seven hundred forty-seven".