78257530853693 has 2 divisors, whose sum is σ = 78257530853694. Its totient is φ = 78257530853692.

The previous prime is 78257530853657. The next prime is 78257530853717. The reversal of 78257530853693 is 39635803575287.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49334356440964 + 28923174412729 = 7023842^2 + 5378027^2 .

It is a cyclic number.

It is not a de Polignac number, because 78257530853693 - 2⁶ = 78257530853629 is a prime.

It is a super-2 number, since 2×78257530853693² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78257530853653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39128765426846 + 39128765426847.

It is an arithmetic number, because the mean of its divisors is an integer number (39128765426847).

Almost surely, 2^{78257530853693} is an apocalyptic number.

It is an amenable number.

78257530853693 is a deficient number, since it is larger than the sum of its proper divisors (1).

78257530853693 is an equidigital number, since it uses as much as digits as its factorization.

78257530853693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072000, while the sum is 71.

The spelling of 78257530853693 in words is "seventy-eight trillion, two hundred fifty-seven billion, five hundred thirty million, eight hundred fifty-three thousand, six hundred ninety-three".