20009916259 has 2 divisors, whose sum is σ = 20009916260. Its totient is φ = 20009916258.

The previous prime is 20009916233. The next prime is 20009916281. The reversal of 20009916259 is 95261990002.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20009916259 - 2⁹ = 20009915747 is a prime.

It is not a weakly prime, because it can be changed into another prime (20009916359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10004958129 + 10004958130.

It is an arithmetic number, because the mean of its divisors is an integer number (10004958130).

Almost surely, 2^20009916259 is an apocalyptic number.

20009916259 is a deficient number, since it is larger than the sum of its proper divisors (1).

20009916259 is an equidigital number, since it uses as much as digits as its factorization.

20009916259 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 87480, while the sum is 43.

The spelling of 20009916259 in words is "twenty billion, nine million, nine hundred sixteen thousand, two hundred fifty-nine".