73785282509 has 2 divisors, whose sum is σ = 73785282510. Its totient is φ = 73785282508.

The previous prime is 73785282437. The next prime is 73785282511. The reversal of 73785282509 is 90528258737.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59184185284 + 14601097225 = 243278^2 + 120835^2 .

It is a cyclic number.

It is not a de Polignac number, because 73785282509 - 2⁸ = 73785282253 is a prime.

Together with 73785282511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (73785282539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36892641254 + 36892641255.

It is an arithmetic number, because the mean of its divisors is an integer number (36892641255).

Almost surely, 2^73785282509 is an apocalyptic number.

It is an amenable number.

73785282509 is a deficient number, since it is larger than the sum of its proper divisors (1).

73785282509 is an equidigital number, since it uses as much as digits as its factorization.

73785282509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8467200, while the sum is 56.

The spelling of 73785282509 in words is "seventy-three billion, seven hundred eighty-five million, two hundred eighty-two thousand, five hundred nine".