70205255509 has 2 divisors, whose sum is σ = 70205255510. Its totient is φ = 70205255508.

The previous prime is 70205255501. The next prime is 70205255557. The reversal of 70205255509 is 90555250207.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64593747409 + 5611508100 = 254153^2 + 74910^2 .

It is an emirp because it is prime and its reverse (90555250207) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 70205255509 - 2³ = 70205255501 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (70205255501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35102627754 + 35102627755.

It is an arithmetic number, because the mean of its divisors is an integer number (35102627755).

Almost surely, 2^70205255509 is an apocalyptic number.

It is an amenable number.

70205255509 is a deficient number, since it is larger than the sum of its proper divisors (1).

70205255509 is an equidigital number, since it uses as much as digits as its factorization.

70205255509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 157500, while the sum is 40.

The spelling of 70205255509 in words is "seventy billion, two hundred five million, two hundred fifty-five thousand, five hundred nine".