1986681793009 has 9 divisors (see below), whose sum is σ = 2034020210553. Its totient is φ = 1940420691972.

The previous prime is 1986681792983. The next prime is 1986681793013. The reversal of 1986681793009 is 9003971866891.

The square root of 1986681793009 is 1409497.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-1986681793009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1986681793039) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 60591982 + ... + 60624760.

It is an arithmetic number, because the mean of its divisors is an integer number (226002245617).

Almost surely, 2^{1986681793009} is an apocalyptic number.

1986681793009 is the 1409497-th square number.

1986681793009 is the 704749-th centered octagonal number.

It is an amenable number.

1986681793009 is a deficient number, since it is larger than the sum of its proper divisors (47338417544).

1986681793009 is an frugal number, since it uses more digits than its factorization.

1986681793009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65644 (or 32822 counting only the distinct ones).

The product of its (nonzero) digits is 35271936, while the sum is 67.

The spelling of 1986681793009 in words is "one trillion, nine hundred eighty-six billion, six hundred eighty-one million, seven hundred ninety-three thousand, nine".