85171167787 has 2 divisors, whose sum is σ = 85171167788. Its totient is φ = 85171167786.

The previous prime is 85171167707. The next prime is 85171167803. The reversal of 85171167787 is 78776117158.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 85171167787 - 2⁷ = 85171167659 is a prime.

It is not a weakly prime, because it can be changed into another prime (85171167707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42585583893 + 42585583894.

It is an arithmetic number, because the mean of its divisors is an integer number (42585583894).

Almost surely, 2^85171167787 is an apocalyptic number.

85171167787 is a deficient number, since it is larger than the sum of its proper divisors (1).

85171167787 is an equidigital number, since it uses as much as digits as its factorization.

85171167787 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4609920, while the sum is 58.

The spelling of 85171167787 in words is "eighty-five billion, one hundred seventy-one million, one hundred sixty-seven thousand, seven hundred eighty-seven".