171355186811 has 2 divisors, whose sum is σ = 171355186812. Its totient is φ = 171355186810.

The previous prime is 171355186781. The next prime is 171355186831. The reversal of 171355186811 is 118681553171.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171355186811 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (171355186831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85677593405 + 85677593406.

It is an arithmetic number, because the mean of its divisors is an integer number (85677593406).

Almost surely, 2^171355186811 is an apocalyptic number.

171355186811 is a deficient number, since it is larger than the sum of its proper divisors (1).

171355186811 is an equidigital number, since it uses as much as digits as its factorization.

171355186811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 201600, while the sum is 47.

The spelling of 171355186811 in words is "one hundred seventy-one billion, three hundred fifty-five million, one hundred eighty-six thousand, eight hundred eleven".