6681245581 has 8 divisors (see below), whose sum is σ = 6929462528. Its totient is φ = 6435072000.

The previous prime is 6681245573. The next prime is 6681245611. The reversal of 6681245581 is 1855421866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6681245581 - 2³ = 6681245573 is a prime.

It is a super-2 number, since 2×6681245581² = 89278085027264055122, 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 (6681245981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504180 + ... + 517261.

It is an arithmetic number, because the mean of its divisors is an integer number (866182816).

Almost surely, 2^6681245581 is an apocalyptic number.

It is an amenable number.

6681245581 is a deficient number, since it is larger than the sum of its proper divisors (248216947).

6681245581 is a wasteful number, since it uses less digits than its factorization.

6681245581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1021683.

The product of its digits is 460800, while the sum is 46.

The square root of 6681245581 is about 81738.8865901659. The cubic root of 6681245581 is about 1883.4429872789.

The spelling of 6681245581 in words is "six billion, six hundred eighty-one million, two hundred forty-five thousand, five hundred eighty-one".