78898425997 has 2 divisors, whose sum is σ = 78898425998. Its totient is φ = 78898425996.

The previous prime is 78898425971. The next prime is 78898426021. The reversal of 78898425997 is 79952489887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 74447668201 + 4450757796 = 272851^2 + 66714^2 .

It is a cyclic number.

It is not a de Polignac number, because 78898425997 - 2⁷ = 78898425869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78898125997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39449212998 + 39449212999.

It is an arithmetic number, because the mean of its divisors is an integer number (39449212999).

Almost surely, 2^78898425997 is an apocalyptic number.

It is an amenable number.

78898425997 is a deficient number, since it is larger than the sum of its proper divisors (1).

78898425997 is an equidigital number, since it uses as much as digits as its factorization.

78898425997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 731566080, while the sum is 76.

The spelling of 78898425997 in words is "seventy-eight billion, eight hundred ninety-eight million, four hundred twenty-five thousand, nine hundred ninety-seven".