79098209257 has 2 divisors, whose sum is σ = 79098209258. Its totient is φ = 79098209256.

The previous prime is 79098209251. The next prime is 79098209303. The reversal of 79098209257 is 75290289097.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76421285136 + 2676924121 = 276444^2 + 51739^2 .

It is a cyclic number.

It is not a de Polignac number, because 79098209257 - 2⁷ = 79098209129 is a prime.

It is not a weakly prime, because it can be changed into another prime (79098209251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39549104628 + 39549104629.

It is an arithmetic number, because the mean of its divisors is an integer number (39549104629).

Almost surely, 2^79098209257 is an apocalyptic number.

It is an amenable number.

79098209257 is a deficient number, since it is larger than the sum of its proper divisors (1).

79098209257 is an equidigital number, since it uses as much as digits as its factorization.

79098209257 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5715360, while the sum is 58.

The spelling of 79098209257 in words is "seventy-nine billion, ninety-eight million, two hundred nine thousand, two hundred fifty-seven".