6689826780541 has 4 divisors (see below), whose sum is σ = 6690600985084. Its totient is φ = 6689052576000.

The previous prime is 6689826780529. The next prime is 6689826780547. The reversal of 6689826780541 is 1450876289866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2809009520100 + 3880817260441 = 1676010^2 + 1969979^2 .

It is a cyclic number.

It is not a de Polignac number, because 6689826780541 - 2²¹ = 6689824683389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689826780547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387089310 + ... + 387106591.

It is an arithmetic number, because the mean of its divisors is an integer number (1672650246271).

Almost surely, 2^{6689826780541} is an apocalyptic number.

It is an amenable number.

6689826780541 is a deficient number, since it is larger than the sum of its proper divisors (774204543).

6689826780541 is an equidigital number, since it uses as much as digits as its factorization.

6689826780541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774204542.

The product of its (nonzero) digits is 278691840, while the sum is 70.

The spelling of 6689826780541 in words is "six trillion, six hundred eighty-nine billion, eight hundred twenty-six million, seven hundred eighty thousand, five hundred forty-one".