85178867819 has 2 divisors, whose sum is σ = 85178867820. Its totient is φ = 85178867818.

The previous prime is 85178867779. The next prime is 85178867849. The reversal of 85178867819 is 91876887158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85178867819 - 2⁸ = 85178867563 is a prime.

It is a super-2 number, since 2×85178867819² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (85178867849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42589433909 + 42589433910.

It is an arithmetic number, because the mean of its divisors is an integer number (42589433910).

Almost surely, 2^85178867819 is an apocalyptic number.

85178867819 is a deficient number, since it is larger than the sum of its proper divisors (1).

85178867819 is an equidigital number, since it uses as much as digits as its factorization.

85178867819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54190080, while the sum is 68.

The spelling of 85178867819 in words is "eighty-five billion, one hundred seventy-eight million, eight hundred sixty-seven thousand, eight hundred nineteen".