78425835857 has 2 divisors, whose sum is σ = 78425835858. Its totient is φ = 78425835856.

The previous prime is 78425835847. The next prime is 78425835877. The reversal of 78425835857 is 75853852487.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 45444006976 + 32981828881 = 213176^2 + 181609^2 .

It is a cyclic number.

It is not a de Polignac number, because 78425835857 - 2⁴ = 78425835841 is a prime.

It is a super-2 number, since 2×78425835857² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78425835857.

It is not a weakly prime, because it can be changed into another prime (78425835847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39212917928 + 39212917929.

It is an arithmetic number, because the mean of its divisors is an integer number (39212917929).

Almost surely, 2^78425835857 is an apocalyptic number.

It is an amenable number.

78425835857 is a deficient number, since it is larger than the sum of its proper divisors (1).

78425835857 is an equidigital number, since it uses as much as digits as its factorization.

78425835857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264000, while the sum is 62.

The spelling of 78425835857 in words is "seventy-eight billion, four hundred twenty-five million, eight hundred thirty-five thousand, eight hundred fifty-seven".