65722609 has 2 divisors, whose sum is σ = 65722610. Its totient is φ = 65722608.

The previous prime is 65722607. The next prime is 65722621. The reversal of 65722609 is 90622756.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46991025 + 18731584 = 6855^2 + 4328^2 .

It is a cyclic number.

It is not a de Polignac number, because 65722609 - 2¹ = 65722607 is a prime.

It is a super-2 number, since 2×65722609² = 8638922667533762, which contains 22 as substring.

Together with 65722607, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (65722607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32861304 + 32861305.

It is an arithmetic number, because the mean of its divisors is an integer number (32861305).

Almost surely, 2^65722609 is an apocalyptic number.

It is an amenable number.

65722609 is a deficient number, since it is larger than the sum of its proper divisors (1).

65722609 is an equidigital number, since it uses as much as digits as its factorization.

65722609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 37.

The square root of 65722609 is about 8106.9481927542. The cubic root of 65722609 is about 403.5570435904.

The spelling of 65722609 in words is "sixty-five million, seven hundred twenty-two thousand, six hundred nine".