66920099 has 2 divisors, whose sum is σ = 66920100. Its totient is φ = 66920098.

The previous prime is 66920089. The next prime is 66920107. The reversal of 66920099 is 99002966.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66920099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66920039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33460049 + 33460050.

It is an arithmetic number, because the mean of its divisors is an integer number (33460050).

Almost surely, 2^66920099 is an apocalyptic number.

66920099 is a deficient number, since it is larger than the sum of its proper divisors (1).

66920099 is an equidigital number, since it uses as much as digits as its factorization.

66920099 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 66920099 is about 8180.4705854859. The cubic root of 66920099 is about 405.9932922121.

The spelling of 66920099 in words is "sixty-six million, nine hundred twenty thousand, ninety-nine".