65399989 has 2 divisors, whose sum is σ = 65399990. Its totient is φ = 65399988.

The previous prime is 65399981. The next prime is 65400007. The reversal of 65399989 is 98999356.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40068900 + 25331089 = 6330^2 + 5033^2 .

It is a cyclic number.

It is not a de Polignac number, because 65399989 - 2³ = 65399981 is a prime.

It is a super-2 number, since 2×65399989² = 8554317122400242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65399981) 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, 32699994 + 32699995.

It is an arithmetic number, because the mean of its divisors is an integer number (32699995).

Almost surely, 2^65399989 is an apocalyptic number.

It is an amenable number.

65399989 is a deficient number, since it is larger than the sum of its proper divisors (1).

65399989 is an equidigital number, since it uses as much as digits as its factorization.

65399989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4723920, while the sum is 58.

The square root of 65399989 is about 8087.0259675606. The cubic root of 65399989 is about 402.8956314649.

The spelling of 65399989 in words is "sixty-five million, three hundred ninety-nine thousand, nine hundred eighty-nine".