65669999 has 2 divisors, whose sum is σ = 65670000. Its totient is φ = 65669998.

The previous prime is 65669971. The next prime is 65670001. The reversal of 65669999 is 99996656.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-65669999 is a prime.

Together with 65670001, it forms a pair of twin primes.

It is a Chen prime.

65669999 is a modest number, since divided by 9999 gives 6566 as remainder.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65669939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32834999 + 32835000.

It is an arithmetic number, because the mean of its divisors is an integer number (32835000).

Almost surely, 2^65669999 is an apocalyptic number.

65669999 is a deficient number, since it is larger than the sum of its proper divisors (1).

65669999 is an equidigital number, since it uses as much as digits as its factorization.

65669999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7085880, while the sum is 59.

The square root of 65669999 is about 8103.7027956361. The cubic root of 65669999 is about 403.4493343156.

The spelling of 65669999 in words is "sixty-five million, six hundred sixty-nine thousand, nine hundred ninety-nine".