66499847 has 2 divisors, whose sum is σ = 66499848. Its totient is φ = 66499846.

The previous prime is 66499843. The next prime is 66499859. The reversal of 66499847 is 74899466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66499847 - 2² = 66499843 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66499843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33249923 + 33249924.

It is an arithmetic number, because the mean of its divisors is an integer number (33249924).

Almost surely, 2^66499847 is an apocalyptic number.

66499847 is a deficient number, since it is larger than the sum of its proper divisors (1).

66499847 is an equidigital number, since it uses as much as digits as its factorization.

66499847 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 53.

The square root of 66499847 is about 8154.7438341128. The cubic root of 66499847 is about 405.1416402416.

The spelling of 66499847 in words is "sixty-six million, four hundred ninety-nine thousand, eight hundred forty-seven".