1989662965920 has 768 divisors, whose sum is σ = 8317124444160. Its totient is φ = 440092984320.

The previous prime is 1989662965909. The next prime is 1989662965937. The reversal of 1989662965920 is 295692669891.

1989662965920 is a `hidden beast` number, since 1 + 9 + 8 + 9 + 6 + 6 + 29 + 6 + 592 + 0 = 666.

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 127 ways as a sum of consecutive naturals, for example, 75919539 + ... + 75945741.

It is an arithmetic number, because the mean of its divisors is an integer number (10829589120).

Almost surely, 2^{1989662965920} is an apocalyptic number.

1989662965920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1989662965920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4158562222080).

1989662965920 is an abundant number, since it is smaller than the sum of its proper divisors (6327461478240).

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

1989662965920 is an equidigital number, since it uses as much as digits as its factorization.

1989662965920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26277 (or 26251 counting only the distinct ones).

The product of its (nonzero) digits is 226748160, while the sum is 72.

The spelling of 1989662965920 in words is "one trillion, nine hundred eighty-nine billion, six hundred sixty-two million, nine hundred sixty-five thousand, nine hundred twenty".