6691683456 has 112 divisors (see below), whose sum is σ = 19987767510. Its totient is φ = 2230530048.

The previous prime is 6691683451. The next prime is 6691683547. The reversal of 6691683456 is 6543861966.

It can be written as a sum of positive squares in only one way, i.e., 6215745600 + 475937856 = 78840^2 + 21816^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6691683451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 57456 + ... + 129168.

Almost surely, 2^6691683456 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6691683456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9993883755).

6691683456 is an abundant number, since it is smaller than the sum of its proper divisors (13296084054).

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

6691683456 is an frugal number, since it uses more digits than its factorization.

6691683456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71745 (or 71718 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 6691683456 is about 81802.7105663376. The cubic root of 6691683456 is about 1884.4232892058.

The spelling of 6691683456 in words is "six billion, six hundred ninety-one million, six hundred eighty-three thousand, four hundred fifty-six".