85778414857 has 2 divisors, whose sum is σ = 85778414858. Its totient is φ = 85778414856.

The previous prime is 85778414849. The next prime is 85778414861. The reversal of 85778414857 is 75841487758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55104745536 + 30673669321 = 234744^2 + 175139^2 .

It is a cyclic number.

It is not a de Polignac number, because 85778414857 - 2³ = 85778414849 is a prime.

It is not a weakly prime, because it can be changed into another prime (85778415857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42889207428 + 42889207429.

It is an arithmetic number, because the mean of its divisors is an integer number (42889207429).

Almost surely, 2^85778414857 is an apocalyptic number.

It is an amenable number.

85778414857 is a deficient number, since it is larger than the sum of its proper divisors (1).

85778414857 is an equidigital number, since it uses as much as digits as its factorization.

85778414857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70246400, while the sum is 64.

The spelling of 85778414857 in words is "eighty-five billion, seven hundred seventy-eight million, four hundred fourteen thousand, eight hundred fifty-seven".