6981865551684 has 81 divisors (see below), whose sum is σ = 17745755571453. Its totient is φ = 2314547240544.

The previous prime is 6981865551673. The next prime is 6981865551719. The reversal of 6981865551684 is 4861555681896.

The square root of 6981865551684 is 2642322.

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

6981865551684 is a `hidden beast` number, since 6 + 9 + 8 + 1 + 8 + 6 + 5 + 551 + 68 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6931477872900 + 50387678784 = 2632770^2 + 224472^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 3154931362 + ... + 3154933574.

Almost surely, 2^{6981865551684} is an apocalyptic number.

6981865551684 is the 2642322-nd square number.

It is an amenable number.

6981865551684 is an abundant number, since it is smaller than the sum of its proper divisors (10763890019769).

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

6981865551684 is an equidigital number, since it uses as much as digits as its factorization.

6981865551684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4834 (or 2417 counting only the distinct ones).

The product of its digits is 497664000, while the sum is 72.

The spelling of 6981865551684 in words is "six trillion, nine hundred eighty-one billion, eight hundred sixty-five million, five hundred fifty-one thousand, six hundred eighty-four".