168890817811 has 2 divisors, whose sum is σ = 168890817812. Its totient is φ = 168890817810.

The previous prime is 168890817803. The next prime is 168890817817. The reversal of 168890817811 is 118718098861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 168890817811 - 2³ = 168890817803 is a prime.

It is not a weakly prime, because it can be changed into another prime (168890817817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84445408905 + 84445408906.

It is an arithmetic number, because the mean of its divisors is an integer number (84445408906).

Almost surely, 2^168890817811 is an apocalyptic number.

168890817811 is a deficient number, since it is larger than the sum of its proper divisors (1).

168890817811 is an equidigital number, since it uses as much as digits as its factorization.

168890817811 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1548288, while the sum is 58.

The spelling of 168890817811 in words is "one hundred sixty-eight billion, eight hundred ninety million, eight hundred seventeen thousand, eight hundred eleven".