166311988807 has 2 divisors, whose sum is σ = 166311988808. Its totient is φ = 166311988806.

The previous prime is 166311988751. The next prime is 166311988889. The reversal of 166311988807 is 708889113661.

It is a weak prime.

It is an emirp because it is prime and its reverse (708889113661) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166311988807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166311988307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83155994403 + 83155994404.

It is an arithmetic number, because the mean of its divisors is an integer number (83155994404).

Almost surely, 2^166311988807 is an apocalyptic number.

166311988807 is a deficient number, since it is larger than the sum of its proper divisors (1).

166311988807 is an equidigital number, since it uses as much as digits as its factorization.

166311988807 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3483648, while the sum is 58.

The spelling of 166311988807 in words is "one hundred sixty-six billion, three hundred eleven million, nine hundred eighty-eight thousand, eight hundred seven".