166311988849 has 16 divisors (see below), whose sum is σ = 175616884800. Its totient is φ = 157062882816.

The previous prime is 166311988807. The next prime is 166311988889. The reversal of 166311988849 is 948889113661.

It is a cyclic number.

It is not a de Polignac number, because 166311988849 - 2²¹ = 166309891697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (166311988889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10596762 + ... + 10612444.

It is an arithmetic number, because the mean of its divisors is an integer number (10976055300).

Almost surely, 2^166311988849 is an apocalyptic number.

166311988849 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

166311988849 is a deficient number, since it is larger than the sum of its proper divisors (9304895951).

166311988849 is a wasteful number, since it uses less digits than its factorization.

166311988849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17424.

The product of its digits is 17915904, while the sum is 64.

The spelling of 166311988849 in words is "one hundred sixty-six billion, three hundred eleven million, nine hundred eighty-eight thousand, eight hundred forty-nine".