78635703253 has 2 divisors, whose sum is σ = 78635703254. Its totient is φ = 78635703252.

The previous prime is 78635703233. The next prime is 78635703269. The reversal of 78635703253 is 35230753687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68213947684 + 10421755569 = 261178^2 + 102087^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78635703253 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78635703197 and 78635703206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78635703233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39317851626 + 39317851627.

It is an arithmetic number, because the mean of its divisors is an integer number (39317851627).

Almost surely, 2^78635703253 is an apocalyptic number.

It is an amenable number.

78635703253 is a deficient number, since it is larger than the sum of its proper divisors (1).

78635703253 is an equidigital number, since it uses as much as digits as its factorization.

78635703253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3175200, while the sum is 49.

The spelling of 78635703253 in words is "seventy-eight billion, six hundred thirty-five million, seven hundred three thousand, two hundred fifty-three".