1986945467816 has 32 divisors (see below), whose sum is σ = 3742422526440. Its totient is φ = 988968204288.

The previous prime is 1986945467803. The next prime is 1986945467861. The reversal of 1986945467816 is 6187645496891.

It can be written as a sum of positive squares in 4 ways, for example, as 1300443736900 + 686501730916 = 1140370^2 + 828554^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 7658330 + ... + 7913526.

Almost surely, 2^{1986945467816} is an apocalyptic number.

It is an amenable number.

1986945467816 is a deficient number, since it is larger than the sum of its proper divisors (1755477058624).

1986945467816 is a wasteful number, since it uses less digits than its factorization.

1986945467816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259613 (or 259609 counting only the distinct ones).

The product of its digits is 627056640, while the sum is 74.

The spelling of 1986945467816 in words is "one trillion, nine hundred eighty-six billion, nine hundred forty-five million, four hundred sixty-seven thousand, eight hundred sixteen".