1988017155156 has 12 divisors (see below), whose sum is σ = 4638706695392. Its totient is φ = 662672385048.

The previous prime is 1988017155151. The next prime is 1988017155191. The reversal of 1988017155156 is 6515517108891.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 1988017155096 and 1988017155105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988017155151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82834048120 + ... + 82834048143.

Almost surely, 2^{1988017155156} is an apocalyptic number.

It is an amenable number.

1988017155156 is an abundant number, since it is smaller than the sum of its proper divisors (2650689540236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1988017155156 is a wasteful number, since it uses less digits than its factorization.

1988017155156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165668096270 (or 165668096268 counting only the distinct ones).

The product of its (nonzero) digits is 3024000, while the sum is 57.

The spelling of 1988017155156 in words is "one trillion, nine hundred eighty-eight billion, seventeen million, one hundred fifty-five thousand, one hundred fifty-six".