6697067581 has 4 divisors (see below), whose sum is σ = 6707199964. Its totient is φ = 6686935200.

The previous prime is 6697067569. The next prime is 6697067681. The reversal of 6697067581 is 1857607966.

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 6188339556 + 508728025 = 78666^2 + 22555^2 .

It is a cyclic number.

It is not a de Polignac number, because 6697067581 - 2¹¹ = 6697065533 is a prime.

It is a super-2 number, since 2×6697067581² = 89701428368962383122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6697067681) 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 3 ways as a sum of consecutive naturals, for example, 5065200 + ... + 5066521.

It is an arithmetic number, because the mean of its divisors is an integer number (1676799991).

Almost surely, 2^6697067581 is an apocalyptic number.

It is an amenable number.

6697067581 is a deficient number, since it is larger than the sum of its proper divisors (10132383).

6697067581 is a wasteful number, since it uses less digits than its factorization.

6697067581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10132382.

The product of its (nonzero) digits is 3810240, while the sum is 55.

The square root of 6697067581 is about 81835.6131583310. The cubic root of 6697067581 is about 1884.9285557145.

The spelling of 6697067581 in words is "six billion, six hundred ninety-seven million, sixty-seven thousand, five hundred eighty-one".