78453785419873 has 2 divisors, whose sum is σ = 78453785419874. Its totient is φ = 78453785419872.

The previous prime is 78453785419753. The next prime is 78453785419907. The reversal of 78453785419873 is 37891458735487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58031592915409 + 20422192504464 = 7617847^2 + 4519092^2 .

It is a cyclic number.

It is not a de Polignac number, because 78453785419873 - 2¹³ = 78453785411681 is a prime.

It is a super-2 number, since 2×78453785419873² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78453785419793 and 78453785419802.

It is not a weakly prime, because it can be changed into another prime (78453785419673) 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, 39226892709936 + 39226892709937.

It is an arithmetic number, because the mean of its divisors is an integer number (39226892709937).

Almost surely, 2^{78453785419873} is an apocalyptic number.

It is an amenable number.

78453785419873 is a deficient number, since it is larger than the sum of its proper divisors (1).

78453785419873 is an equidigital number, since it uses as much as digits as its factorization.

78453785419873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5689958400, while the sum is 79.

The spelling of 78453785419873 in words is "seventy-eight trillion, four hundred fifty-three billion, seven hundred eighty-five million, four hundred nineteen thousand, eight hundred seventy-three".