1989707871816 has 96 divisors (see below), whose sum is σ = 6158846491200. Its totient is φ = 568467020160.

The previous prime is 1989707871787. The next prime is 1989707871829. The reversal of 1989707871816 is 6181787079891.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18144271 + ... + 18253601.

It is an arithmetic number, because the mean of its divisors is an integer number (64154650950).

Almost surely, 2^{1989707871816} is an apocalyptic number.

It is an amenable number.

1989707871816 is an abundant number, since it is smaller than the sum of its proper divisors (4169138619384).

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

1989707871816 is a wasteful number, since it uses less digits than its factorization.

1989707871816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145459 (or 145452 counting only the distinct ones).

The product of its (nonzero) digits is 85349376, while the sum is 72.

The spelling of 1989707871816 in words is "one trillion, nine hundred eighty-nine billion, seven hundred seven million, eight hundred seventy-one thousand, eight hundred sixteen".