85391861077 has 2 divisors, whose sum is σ = 85391861078. Its totient is φ = 85391861076.

The previous prime is 85391861059. The next prime is 85391861081. The reversal of 85391861077 is 77016819358.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84821320081 + 570540996 = 291241^2 + 23886^2 .

It is a cyclic number.

It is not a de Polignac number, because 85391861077 - 2²⁷ = 85257643349 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85391861377) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42695930538 + 42695930539.

It is an arithmetic number, because the mean of its divisors is an integer number (42695930539).

Almost surely, 2^85391861077 is an apocalyptic number.

It is an amenable number.

85391861077 is a deficient number, since it is larger than the sum of its proper divisors (1).

85391861077 is an equidigital number, since it uses as much as digits as its factorization.

85391861077 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 55.

The spelling of 85391861077 in words is "eighty-five billion, three hundred ninety-one million, eight hundred sixty-one thousand, seventy-seven".