69995561 has 2 divisors, whose sum is σ = 69995562. Its totient is φ = 69995560.

The previous prime is 69995543. The next prime is 69995567. The reversal of 69995561 is 16559996.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39137536 + 30858025 = 6256^2 + 5555^2 .

It is a cyclic number.

It is not a de Polignac number, because 69995561 - 2²² = 65801257 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (69995567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34997780 + 34997781.

It is an arithmetic number, because the mean of its divisors is an integer number (34997781).

Almost surely, 2^69995561 is an apocalyptic number.

It is an amenable number.

69995561 is a deficient number, since it is larger than the sum of its proper divisors (1).

69995561 is an equidigital number, since it uses as much as digits as its factorization.

69995561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 656100, while the sum is 50.

The square root of 69995561 is about 8366.3349801451. The cubic root of 69995561 is about 412.1198181846.

The spelling of 69995561 in words is "sixty-nine million, nine hundred ninety-five thousand, five hundred sixty-one".