196435782509 has 2 divisors, whose sum is σ = 196435782510. Its totient is φ = 196435782508.

The previous prime is 196435782503. The next prime is 196435782553. The reversal of 196435782509 is 905287534691.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 171062478409 + 25373304100 = 413597^2 + 159290^2 .

It is a cyclic number.

It is not a de Polignac number, because 196435782509 - 2¹⁶ = 196435716973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (196435782503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98217891254 + 98217891255.

It is an arithmetic number, because the mean of its divisors is an integer number (98217891255).

It is a 1-persistent number, because it is pandigital, but 2⋅196435782509 = 392871565018 is not.

Almost surely, 2^196435782509 is an apocalyptic number.

It is an amenable number.

196435782509 is a deficient number, since it is larger than the sum of its proper divisors (1).

196435782509 is an equidigital number, since it uses as much as digits as its factorization.

196435782509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16329600, while the sum is 59.

The spelling of 196435782509 in words is "one hundred ninety-six billion, four hundred thirty-five million, seven hundred eighty-two thousand, five hundred nine".