1987105161708 has 72 divisors (see below), whose sum is σ = 5549664583008. Its totient is φ = 596300947968.

The previous prime is 1987105161659. The next prime is 1987105161709. The reversal of 1987105161708 is 8071615017891.

1987105161708 is a `hidden beast` number, since 1 + 9 + 8 + 7 + 10 + 5 + 1 + 617 + 0 + 8 = 666.

It is not an unprimeable number, because it can be changed into a prime (1987105161709) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70570791 + ... + 70598942.

It is an arithmetic number, because the mean of its divisors is an integer number (77078674764).

Almost surely, 2^{1987105161708} is an apocalyptic number.

1987105161708 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1987105161708 is an abundant number, since it is smaller than the sum of its proper divisors (3562559421300).

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

1987105161708 is a wasteful number, since it uses less digits than its factorization.

1987105161708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141169783 (or 141169778 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 54.

The spelling of 1987105161708 in words is "one trillion, nine hundred eighty-seven billion, one hundred five million, one hundred sixty-one thousand, seven hundred eight".