65440189 has 2 divisors, whose sum is σ = 65440190. Its totient is φ = 65440188.

The previous prime is 65440181. The next prime is 65440201. The reversal of 65440189 is 98104456.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39000025 + 26440164 = 6245^2 + 5142^2 .

It is a cyclic number.

It is not a de Polignac number, because 65440189 - 2³ = 65440181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65440181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32720094 + 32720095.

It is an arithmetic number, because the mean of its divisors is an integer number (32720095).

Almost surely, 2^65440189 is an apocalyptic number.

It is an amenable number.

65440189 is a deficient number, since it is larger than the sum of its proper divisors (1).

65440189 is an equidigital number, since it uses as much as digits as its factorization.

65440189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 65440189 is about 8089.5110482649. The cubic root of 65440189 is about 402.9781650516.

The spelling of 65440189 in words is "sixty-five million, four hundred forty thousand, one hundred eighty-nine".