1988967826161 has 32 divisors (see below), whose sum is σ = 3093144606720. Its totient is φ = 1260732469392.

The previous prime is 1988967826159. The next prime is 1988967826171. The reversal of 1988967826161 is 1616287698891.

It is not a de Polignac number, because 1988967826161 - 2¹ = 1988967826159 is a prime.

It is a super-2 number, since 2×1988967826161² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1988967826161.

It is not an unprimeable number, because it can be changed into a prime (1988967826151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9485655 + ... + 9693068.

It is an arithmetic number, because the mean of its divisors is an integer number (96660768960).

Almost surely, 2^{1988967826161} is an apocalyptic number.

It is an amenable number.

1988967826161 is a deficient number, since it is larger than the sum of its proper divisors (1104176780559).

1988967826161 is a wasteful number, since it uses less digits than its factorization.

1988967826161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19178922 (or 19178916 counting only the distinct ones).

The product of its digits is 125411328, while the sum is 72.

The spelling of 1988967826161 in words is "one trillion, nine hundred eighty-eight billion, nine hundred sixty-seven million, eight hundred twenty-six thousand, one hundred sixty-one".