66505099 has 2 divisors, whose sum is σ = 66505100. Its totient is φ = 66505098.

The previous prime is 66505097. The next prime is 66505147. The reversal of 66505099 is 99050566.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66505099 - 2¹ = 66505097 is a prime.

Together with 66505097, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (66505093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33252549 + 33252550.

It is an arithmetic number, because the mean of its divisors is an integer number (33252550).

Almost surely, 2^66505099 is an apocalyptic number.

66505099 is a deficient number, since it is larger than the sum of its proper divisors (1).

66505099 is an equidigital number, since it uses as much as digits as its factorization.

66505099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72900, while the sum is 40.

The square root of 66505099 is about 8155.0658489064. The cubic root of 66505099 is about 405.1523056690.

The spelling of 66505099 in words is "sixty-six million, five hundred five thousand, ninety-nine".