1989766343456 has 48 divisors (see below), whose sum is σ = 3953598955488. Its totient is φ = 985684761600.

The previous prime is 1989766343447. The next prime is 1989766343501. The reversal of 1989766343456 is 6543436679891.

It is a self number, because there is not a number n which added to its sum of digits gives 1989766343456.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9043391 + ... + 9260801.

It is an arithmetic number, because the mean of its divisors is an integer number (82366644906).

Almost surely, 2^{1989766343456} is an apocalyptic number.

1989766343456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1989766343456 is a deficient number, since it is larger than the sum of its proper divisors (1963832612032).

1989766343456 is a wasteful number, since it uses less digits than its factorization.

1989766343456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220065 (or 220057 counting only the distinct ones).

The product of its digits is 705438720, while the sum is 71.

The spelling of 1989766343456 in words is "one trillion, nine hundred eighty-nine billion, seven hundred sixty-six million, three hundred forty-three thousand, four hundred fifty-six".