78205456253 has 2 divisors, whose sum is σ = 78205456254. Its totient is φ = 78205456252.

The previous prime is 78205456247. The next prime is 78205456309. The reversal of 78205456253 is 35265450287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74124418564 + 4081037689 = 272258^2 + 63883^2 .

It is a cyclic number.

It is not a de Polignac number, because 78205456253 - 2²⁶ = 78138347389 is a prime.

It is a super-2 number, since 2×78205456253² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78205456198 and 78205456207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78205756253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39102728126 + 39102728127.

It is an arithmetic number, because the mean of its divisors is an integer number (39102728127).

Almost surely, 2^78205456253 is an apocalyptic number.

It is an amenable number.

78205456253 is a deficient number, since it is larger than the sum of its proper divisors (1).

78205456253 is an equidigital number, since it uses as much as digits as its factorization.

78205456253 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2016000, while the sum is 47.

The spelling of 78205456253 in words is "seventy-eight billion, two hundred five million, four hundred fifty-six thousand, two hundred fifty-three".