65561407 has 2 divisors, whose sum is σ = 65561408. Its totient is φ = 65561406.

The previous prime is 65561383. The next prime is 65561413. The reversal of 65561407 is 70416556.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 65561407 - 2¹¹ = 65559359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65561467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32780703 + 32780704.

It is an arithmetic number, because the mean of its divisors is an integer number (32780704).

Almost surely, 2^65561407 is an apocalyptic number.

65561407 is a deficient number, since it is larger than the sum of its proper divisors (1).

65561407 is an equidigital number, since it uses as much as digits as its factorization.

65561407 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 65561407 is about 8096.9998764975. Note that the first 3 decimals coincide. The cubic root of 65561407 is about 403.2268301694.

The spelling of 65561407 in words is "sixty-five million, five hundred sixty-one thousand, four hundred seven".