23209958809 has 2 divisors, whose sum is σ = 23209958810. Its totient is φ = 23209958808.

The previous prime is 23209958797. The next prime is 23209958851. The reversal of 23209958809 is 90885990232.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19914854400 + 3295104409 = 141120^2 + 57403^2 .

It is a cyclic number.

It is not a de Polignac number, because 23209958809 - 2³³ = 14620024217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 23209958809.

It is not a weakly prime, because it can be changed into another prime (23209959809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11604979404 + 11604979405.

It is an arithmetic number, because the mean of its divisors is an integer number (11604979405).

Almost surely, 2^23209958809 is an apocalyptic number.

It is an amenable number.

23209958809 is a deficient number, since it is larger than the sum of its proper divisors (1).

23209958809 is an equidigital number, since it uses as much as digits as its factorization.

23209958809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2799360, while the sum is 55.

The spelling of 23209958809 in words is "twenty-three billion, two hundred nine million, nine hundred fifty-eight thousand, eight hundred nine".