1986957444672 has 84 divisors (see below), whose sum is σ = 5697638675820. Its totient is φ = 662041915392.

The previous prime is 1986957444649. The next prime is 1986957444701. The reversal of 1986957444672 is 2764447596891.

1986957444672 is a `hidden beast` number, since 1 + 9 + 8 + 6 + 9 + 574 + 4 + 46 + 7 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 22205768256 + 1964751676416 = 149016^2 + 1401696^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 1986957444672.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 657604 + ... + 2099132.

It is an arithmetic number, because the mean of its divisors is an integer number (67829031855).

Almost surely, 2^{1986957444672} is an apocalyptic number.

1986957444672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1986957444672 is an abundant number, since it is smaller than the sum of its proper divisors (3710681231148).

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

1986957444672 is a wasteful number, since it uses less digits than its factorization.

1986957444672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1443940 (or 1443927 counting only the distinct ones).

The product of its digits is 731566080, while the sum is 72.

The spelling of 1986957444672 in words is "one trillion, nine hundred eighty-six billion, nine hundred fifty-seven million, four hundred forty-four thousand, six hundred seventy-two".