6687535421 has 16 divisors (see below), whose sum is σ = 7679992320. Its totient is φ = 5704415280.

The previous prime is 6687535409. The next prime is 6687535427. The reversal of 6687535421 is 1245357866.

It is a cyclic number.

It is not a de Polignac number, because 6687535421 - 2¹⁸ = 6687273277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6687535427) 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, 1586006 + ... + 1590216.

It is an arithmetic number, because the mean of its divisors is an integer number (479999520).

Almost surely, 2^6687535421 is an apocalyptic number.

It is an amenable number.

6687535421 is a deficient number, since it is larger than the sum of its proper divisors (992456899).

6687535421 is a wasteful number, since it uses less digits than its factorization.

6687535421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5264.

The product of its digits is 1209600, while the sum is 47.

The square root of 6687535421 is about 81777.3527390071. The cubic root of 6687535421 is about 1884.0338371597.

The spelling of 6687535421 in words is "six billion, six hundred eighty-seven million, five hundred thirty-five thousand, four hundred twenty-one".