6698540521 has 16 divisors (see below), whose sum is σ = 6890184000. Its totient is φ = 6509550528.

The previous prime is 6698540489. The next prime is 6698540557. The reversal of 6698540521 is 1250458966.

It is a cyclic number.

It is not a de Polignac number, because 6698540521 - 2⁵ = 6698540489 is a prime.

It is a super-2 number, since 2×6698540521² = 89740890222957902882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6698540561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4323655 + ... + 4325203.

It is an arithmetic number, because the mean of its divisors is an integer number (430636500).

Almost surely, 2^6698540521 is an apocalyptic number.

It is an amenable number.

6698540521 is a deficient number, since it is larger than the sum of its proper divisors (191643479).

6698540521 is a wasteful number, since it uses less digits than its factorization.

6698540521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2328.

The product of its (nonzero) digits is 518400, while the sum is 46.

The square root of 6698540521 is about 81844.6120462428. The cubic root of 6698540521 is about 1885.0667347565.

The spelling of 6698540521 in words is "six billion, six hundred ninety-eight million, five hundred forty thousand, five hundred twenty-one".