78400308797 has 2 divisors, whose sum is σ = 78400308798. Its totient is φ = 78400308796.

The previous prime is 78400308769. The next prime is 78400308803. The reversal of 78400308797 is 79780300487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54217259716 + 24183049081 = 232846^2 + 155509^2 .

It is a cyclic number.

It is not a de Polignac number, because 78400308797 - 2⁶ = 78400308733 is a prime.

It is a super-2 number, since 2×78400308797² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78400308997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39200154398 + 39200154399.

It is an arithmetic number, because the mean of its divisors is an integer number (39200154399).

Almost surely, 2^78400308797 is an apocalyptic number.

It is an amenable number.

78400308797 is a deficient number, since it is larger than the sum of its proper divisors (1).

78400308797 is an equidigital number, since it uses as much as digits as its factorization.

78400308797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2370816, while the sum is 53.

The spelling of 78400308797 in words is "seventy-eight billion, four hundred million, three hundred eight thousand, seven hundred ninety-seven".