168705772811 has 2 divisors, whose sum is σ = 168705772812. Its totient is φ = 168705772810.

The previous prime is 168705772687. The next prime is 168705772849. The reversal of 168705772811 is 118277507861.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168705772811 is a prime.

It is not a weakly prime, because it can be changed into another prime (168705792811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84352886405 + 84352886406.

It is an arithmetic number, because the mean of its divisors is an integer number (84352886406).

Almost surely, 2^168705772811 is an apocalyptic number.

168705772811 is a deficient number, since it is larger than the sum of its proper divisors (1).

168705772811 is an equidigital number, since it uses as much as digits as its factorization.

168705772811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1317120, while the sum is 53.

The spelling of 168705772811 in words is "one hundred sixty-eight billion, seven hundred five million, seven hundred seventy-two thousand, eight hundred eleven".