66299957 has 2 divisors, whose sum is σ = 66299958. Its totient is φ = 66299956.

The previous prime is 66299953. The next prime is 66299963. The reversal of 66299957 is 75999266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64625521 + 1674436 = 8039^2 + 1294^2 .

It is a cyclic number.

It is not a de Polignac number, because 66299957 - 2² = 66299953 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66299899 and 66299908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66299951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33149978 + 33149979.

It is an arithmetic number, because the mean of its divisors is an integer number (33149979).

Almost surely, 2^66299957 is an apocalyptic number.

It is an amenable number.

66299957 is a deficient number, since it is larger than the sum of its proper divisors (1).

66299957 is an equidigital number, since it uses as much as digits as its factorization.

66299957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1837080, while the sum is 53.

The square root of 66299957 is about 8142.4785538557. The cubic root of 66299957 is about 404.7352982515.

The spelling of 66299957 in words is "sixty-six million, two hundred ninety-nine thousand, nine hundred fifty-seven".