65561269 has 2 divisors, whose sum is σ = 65561270. Its totient is φ = 65561268.

The previous prime is 65561239. The next prime is 65561281. The reversal of 65561269 is 96216556.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53100369 + 12460900 = 7287^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 65561269 - 2¹³ = 65553077 is a prime.

It is a super-2 number, since 2×65561269² = 8596559985780722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65561219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32780634 + 32780635.

It is an arithmetic number, because the mean of its divisors is an integer number (32780635).

Almost surely, 2^65561269 is an apocalyptic number.

It is an amenable number.

65561269 is a deficient number, since it is larger than the sum of its proper divisors (1).

65561269 is an equidigital number, since it uses as much as digits as its factorization.

65561269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 40.

The square root of 65561269 is about 8096.9913548182. The cubic root of 65561269 is about 403.2265472522.

The spelling of 65561269 in words is "sixty-five million, five hundred sixty-one thousand, two hundred sixty-nine".