20164425109 has 2 divisors, whose sum is σ = 20164425110. Its totient is φ = 20164425108.

The previous prime is 20164425091. The next prime is 20164425121. The reversal of 20164425109 is 90152446102.

Together with previous prime (20164425091) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13899702609 + 6264722500 = 117897^2 + 79150^2 .

It is a cyclic number.

It is not a de Polignac number, because 20164425109 - 2²¹ = 20162327957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20164425409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10082212554 + 10082212555.

It is an arithmetic number, because the mean of its divisors is an integer number (10082212555).

Almost surely, 2^20164425109 is an apocalyptic number.

It is an amenable number.

20164425109 is a deficient number, since it is larger than the sum of its proper divisors (1).

20164425109 is an equidigital number, since it uses as much as digits as its factorization.

20164425109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 34.

The spelling of 20164425109 in words is "twenty billion, one hundred sixty-four million, four hundred twenty-five thousand, one hundred nine".